The SPOT platforms consist of three aluminium decks:

• The bottom deck has four vertical corner rods upon which the upper two decks are stacked. This deck holds the propulsion and floatation systems. Within the bottom deck (called the sub-deck in the image) the thruster solenoid valves are contained.
• The middle deck contains the avionics (power subsystem, main computer, reaction wheel, robot manipulator)
• The top deck contains sensors

Which are covered by five acrylic panels to protect the internal components and to make the platforms look super cool.

An assembly is shown below:

CAD Files

The CAD files for all of the components can be found here

Engineering Drawings

The engineering drawings to manufacture the components can be found here

Assembly instructions

An IKEA-style guide to assemble the platforms can be found here

Docking Interface Measurements

The body frame $\mathcal{F}_B = \lbrace \vec{\mathcal{B}}_x \ \vec{\mathcal{B}}_y \ \vec{\mathcal{B}}_z \rbrace^\top$ of a platform is defined as follows: The front face where you can access the onboard computer (the Jetson Xavier NX, for the current configuration) is the +x-axis, $\vec{\mathcal{B}}_x$. This is directly opposite the control panel, i.e., the control panel is in the -x-direction. The face with the pressure gauges (and docking interface, in the case of the chaser and target) are in the +y-axis, $\vec{\mathcal{B}}_y$. Directly upward through the top of the platform is the +z-axis, $\vec{\mathcal{B}}_z$.

Male and female docking interfaces can be attached onto the chaser and target platforms, respectively. Rough measurements of the positions of the docking interfaces are provided (in cm) below:

When docked, the chaser and target are oriented as shown in the figure below, with relevant (rough) measurements given in cm: