Various designs are available for you to choose to build

Model 1

(no remaining example/unsupported)
Pi 2
5" screen
Wireless keyboard/mouse
Integrated stylus
Cellular data
Bluetooth
Audio amplification/speaker
Rear facing mini Pi camera
Front facing USB webcam/microphone
Notification light
Flashlight
Software i2c battery controls
Preliminary cellular location features
Next

Model 2

(unsupported)
this is an early attempt at making a thin design.
Next

Model 3

(unsupported)
this is a "Hackberry" device with a built-in keyboard.
Next

Model 4

(unsupported)
this is a cellular connected 7" MID/Tablet/Phone.
Next

Model 5

(no remaining example/unsupported)
this is a audio optimized 4G LTE device featuring a 5" screen.
Next

Model 6

(no remaining example/unsupported)
this is an attempt at making a small design.
Next

Model 7

(unsupported)
easier to build evolution of Model 6 with new style power supply.
Next

Model 8

(no remaining example/unsupported)
easier to build evolution of Model 6 with LTE radio protruding from top.
Next

Model 9

(no remaining example/unsupported)
this design is a compromise between size and speed.
Next

Model Zero

(unsupported)
this is the smallest and thinnest model available featuring a 4" 480x320 SPI screen.
Next

Model 11

(no remaining example/unsupported)
development model with odroid c2 and 5" screen

Model 12

(no remaining example/unsupported)
development model with odroid c0 and 5" screen

Model 13

(unsupported)
development model with odroid c0 and 7" screen

Model 14

(no remaining example/unsupported)
reasoning: 7" is too bulky and requires external power supply
reasoning: external power supply is too bulky and unmonitored
5" screen
+odroid c0 with soldering points fully visible
+1 battery

Model 15

(no remaining example/unsupported)
odroid c0 with soldering points fully visible
1 battery
+cellular device fully exposed attached to 3d printed bracket
+5" capacitive waveshare touchscreen
+only remove hub top cover keeping all strain reliefs intact
+solder pins to i2s instead of wires
Next

Model 16

(no remaining example/unsupported)
+more easily replaceable battery
+better accessability of components
+higher speed
+more ram
+more reliable usb
+less width
+x86 software compatibility
-50% thicker
-25% more power used
-battery monitoring removed
Extra Notes:
lattepanda/5" screen/round/nonapplicable battery/bottom sideways cellular
-awkward large size
-power usage
-heat production
+speed
+stability
+x86 compatibility
Next

Model 17

(no remaining example/unsupported)
+reduced sound circuitry with hdmi audio compared to model 15
+secondary power supply for stability added compared to model 15
+adc battery monitoring added compared to model 16
+backup onboard usb charging added compared to model 16
+better efficency/battery life compared to model 16
+less heat buildup compared to model 16
+less thickness compared to model 16
+less length compared to model 16
-slower speed compared to model 16
-less ram compared to model 16
extra notes:
odroid c0/5" screen/flat/modified side by side battery/bottom sideways cellular
-awkward large size
-see "getting away from odroid c0"
+thinness
+onboard adc
+power usage
+heat production
Next

Model 18

(no remaining example/unsupported)
pi zero/4.3" screen/prototype
-extreme slowness

Model 19

(unsupported)
odroid c0/4.3" screen/flat/stacked battery/top vertical cellular
-instability
-top vertical cellular design

Model 20

(no remaining example/unsupported)
pi 4/4.3" screen/flat/(vertical) side by side cellular
-awkward footprint
+good sbc access and cooling

Model 21

(no remaining example/unsupported)
lattepanda/5" screen/flat/stacked battery/stacked cellular
-1 cm thicker than model 16
+vastly reduced footprint compared to model 16
+reduced battery wiring complexity
+reduced screen wiring complexity
+added voltmeter compared to model 16
Next

Model 22

(no remaining example/unsupported)
pi 4/5" screen/flat/(vertical) side by side cellular
vertical is much less wide than horizontal side by side
vertical allows for saving depth by putting sbc connectors below battery depth
vertical allows for better fitment of fpv micro hdmi cable
+similar depth but much smaller overall footprint than model 17
-1cm wider than model 17
+faster than model 17
-lack of adc compared to model 17

Model 23

(no remaining example/unsupported)
lattepanda/4.3" screen/flat/stacked battery/stacked cellular
-1 cm thicker than model 16
+vastly reduced footprint compared to model 16
+reduced battery wiring complexity
+even greater reduced screen wiring complexity compared to model 21
+added voltmeter compared to model 16
Next

Model 24

(no remaining example/unsupported)
odroid c0/5" screen
custom screen switch cable attached to hub port
soldered screen microusb unused
soldered hub
bad usb wiring

Model 25

(no remaining example/unsupported)
odroid c0/5" screen
rear cellular design
similar wiring to model 19
built for maximum battery life of about 48 hours
awkward size
typical odroid c0 instability

Model 26

(no remaining example/unsupported)
Teryza pc stick/5" screen
2 horizontally oriented squareish batteries in parallel
340 cellular device on back
keyboard slider design
no custom usb wiring required
plagued by low battery voltage bugs and no power savings
died during usb testing

Model 27

(no remaining example/unsupported)
Aoxun pc stick/5" screen
1 vertically oriented large rectangular battery
new cellular device on side
smartphone design
screen power switch for debugging
plagued by low battery voltage bugs and no power savings

Model 28

(no remaining example/unsupported)
VIM3/4.3" screen
1 horizontally oriented squareish battery
340 cellular device on back
smartphone design
regular non-angled hdmi and usb cables
very short battery life
Next

Model 29

(no remaining example/unsupported)
VIM3/4.3" screen
1 vertically oriented 12v large blue lithium ion battery
340 cellular device on front on top of VIM3
unconventional brick design
battery serves as frame, power switch, and power conversion
exceptional battery life
Next

Model 30

(no remaining example/unsupported)
VIM3/5" screen
1 vertically oriented 12v large blue lithium ion battery between device and screen
new cellular device on side
smartphone design
no hub using usb-c as third data port
short battery life

Model 31

(no remaining example/unsupported)
VIM3/5" screen
1 vertically oriented gargantuan 12v lead acid battery
new cellular device on side
unconventional brick design
high availability and safety of lead acid battery
exceptional battery life
Next

Model 32

(no remaining example/unsupported)
VIM3/5" screen
1 vertically oriented 12v small blue lithium ion battery between device and screen
340 cellular device on back
smartphone design
middle ground between a huge battery and a useless one
moderate battery life
Next

Model 33

(no remaining example/unsupported)
Lattepanda Delta/5" screen
1 vertically oriented 12v small blue lithium ion battery between device and screen
340 cellular device on back
thick phablet design
short battery life
rebuilt into model 36

Model 34

(no remaining example/unsupported)
Lattepanda Alpha/4.3" screen
1 vertically oriented 12v large blue lithium ion battery between device and screen
340 cellular device on side
brick phone design
moderate battery life
rebuilt into model 37

Model 35

(no remaining example/unsupported)
Lattepanda original/5" screen
1 vertically oriented 12v small blue lithium ion battery with step down between device and screen
340 cellular device on back
thick phablet design
short battery life
thickness - 2.1 inches
Next

Model 36

(no remaining example/unsupported)
Lattepanda Delta/5" screen
1 vertically oriented 12v custom lithium ion battery
VSVABEFV cellular device on side
phablet design
moderate battery life
thickness - 1.3 inches
Next

Model 37

(no remaining example/unsupported)
Lattepanda Alpha/4.3" screen with Typo Keyboard integrated
1 vertically oriented 12v small blue lithium ion battery
ZTE cellular device on side
hackberry design
short battery life
thickness - 2.1 inches
Next

Model 38

(unsupported)
VIM3/4.3" screen
1 vertically oriented 7.4v custom lithium ion battery
ZTE cellular device on side
smartphone design
moderate battery life
thickness - 1.1 inches - more like 1.25 inches
Next

Model 39

(no remaining example/unsupported)
development model with lattepanda delta and lead acid battery and 5" screen
thickness - about 2.25"

Model 40

(no remaining example/unsupported)
development model with lattepanda alpha and large 3s battery and 4" screen
thickness - about 2.75"

Model 41

(no remaining example/unsupported)
development model with lattepanda alpha and small 3s battery and 4" screen
thickness - about 2.5"

Model 42

(no remaining example/unsupported)
an improved Model 27
Aoxun z8350 PC stick with 8GB RAM and Bluetooth
5" screen with audio
custom 2s battery with step down and USB-C charge connector
cellular connected as usual
custom USB harness with dedicated screen cable and hub tied together with switch
optimized microphone location
thickness - about 1.5"
Next

Model 43

(no remaining example/unsupported)
development model with Lattepanda Alpha and medium 3s battery and 4" screen
thickness - about 1.75"

Model 44

(no remaining example/unsupported)
an improved Model 36
Lattepanda Delta
5" screen with audio
custom 3s battery with USB-C charge connector
cellular connected as usual
switched USB ports method
bottom USB port freed for microphone usage
USB-C port freed for dual display usage
no extra hub for space and power savings
thickness - about 1.3"
Next

Model 45

(no remaining example/unsupported)
development FreeBSD cellular tablet model with Udoo x86 Ultra version 1
thickness - about 1.7"

Model 46

(no remaining example/unsupported)
development high standby battery life model with VIM 3
thickness - about 2.7"

Model 47

(no remaining example/unsupported)
an improved Model 42
Aoxun z8350 PC stick with 8GB RAM and Bluetooth
5" OLED screen with 5v micro external audio amplifier
custom 2s battery with step down and USB-C charge connector
cellular connected as usual
custom USB harness with dedicated screen cable and hub tied together with switch
thickness - about 2"

Model 48

(unsupported)
an improved Model 44
Lattepanda Delta 3
5" screen with audio
custom 3s battery with USB-C charge connector
cellular connected as usual
no USB switch needed but system power switch installed
bottom USB port freed for microphone usage
USB-C port freed for dual display usage
no extra hub for space and power savings
thickness - about 1.7"
Next

Model 49

(no remaining example/unsupported)
development USB battery/gaming model with Lattepanda Delta 432 and 5" OLED
thickness - about 2"

Model 50

(supported)
USB battery model with small size, easier build and software simplicity
thickness - about 1.75"
Next

Model 51

(supported)
USB battery model with small size, OLED, high resolution, dual display and better speed
thickness - about 2"
Next