These are the formats of the different objects

Brush
LODMesh
Mesh
Model
Palette
Polys
Texture

• objectproperties

LODMesh is a subclass of Mesh, so all data from Mesh is before the LODMesh data.

• index - CollapsePointThus_Count
• each CollapsePointThus_Count
  • short - CollapsePointThus
• index - FaceLevel_Count
• each FaceLevel_Count
  • short - FaceLevel
• index - Faces_Count
• each Faces_Count
  • short - WedgeIndex1
  • short - WedgeIndex2
  • short - WedgeIndex3
  • short - MaterialIndex_
• index - CollapseWedgeThus_Count
• each CollapseWedgeThus_Count
  • word CollapseWedgeThus
• index Wedges_Count
• each Wedges_Count
  • short - VertexIndex
  • byte - S
  • byte - T
• index Materials_Count
• each Materials_Count
  • long - Flags
  • long - TextureIndex
• index SpecialFaces_Count
• each SpecialFaces_Count
  • short SpecialWedgeIndex1
  • short SpecialWedgeIndex2
  • short SpecialWedgeIndex3
  • short SpecialMaterialIndex4
• long - ModelVerts
• long - SpecialVerts
• float - MeshScaleMax
• float - LODHysterisis
• float - LODStrength
• long - LoDMinVerts
• float - LODMorph
• float LODZDisplace
• index ReMapAnimVerts_Count
• each ReMapAnimVerts_Count
  • short ReMapAnimVerts
• long - OldFrameVerts

• objectproperties
• boundingbox - Primitive.Boundingbox
• boundingsphere - Primitive.BoundingSphere
• if (version >61)
  • long - Verts_Jump
• index - Verts_Count
• each Verts_Count
  • long - XYZ
• if (version > 61)
  • long - Tris_Jump
• index - Tris_Count
• each Tris_Count
  • short - VertexIndex1
  • short - VertexIndex2
  • short - VertexIndex3
  • byte - VertexIndex1_U
  • byte - VertexIndex1_V
  • byte - VertexIndex2_U
  • byte - VertexIndex2_V
  • byte - VertexIndex3_U
  • byte - VertexIndex3_V
  • long - Flags
  • long - TextureIndex
• index - AnimSeqs_Count
• each AbumSeqs_Count
  • index - Name
  • index - Group
  • long - Start_Frame
  • long - Num_Frames
  • index - Function_Count
  • each Function_Count
    • long - Time
    • index - Function
  • float - Rate
• long - Connects_jump
• index - Connects_count
• each Connects_count
  • long - NumVerTriangles
  • long - TriangleListOfset
• boundingbox - BoundingBox
• boundingsphere - BoundingSphere
• long - VertLinks_Jump
• index - VertLinks_Count
• each VertLinks_Count
  • long - VertLink
• index - Texture_Count
• each Texture_Count
  • index Texture
• index BoundingBoxes_Count
• each BoundingBoxes_Count
  • boundingbox - BoundingBoxes
• index BoundingSpheres_Count
• each BoundingSpheres_Count
  • boundingsphre - BoundingSpheres
• long - FrameVerts
• long - AnimVerts
• long - ANDFlags
• long - ORFlags
• vector - Scale
• vector - Origin
• rotator - RotOrigin
• long - CurPoly
• long - CurVertex
• if version == 65
  • float - TextureLOD?
• if version > 65
  • index - Texture_LOD_Count
  • each Texture_LOD_Count
    • float - TextureLOD

• objectproperties
• 54 bytes - no idea
• index - export property polys
• 14 bytes - no idea

• objectproperties
• index - PaletteSize
• each PalletteSize
  • byte - Red
  • byte - Green
  • byte - Blue
  • byte - Alpha

• objectproperties
• long - numPolys
• long - arrayLength
• each arrayLength
  • index - numcoords
  • float - base_x
  • float - base_y
  • float - base_z
  • float - normal_x
  • float - normal_y
  • float - normal_z
  • float - texu_x
  • float - texu_y
  • float - texu_z
  • float - texv_x
  • float - texv_y
  • float - texv_z
  • each numcoords
    • float x
    • float y
    • float z
  • long - polyflags
  • index - actor
  • index - texture
  • index - itemname
  • index - ilink
  • index - ibrushpoly
  • short - panu
  • short - panv

• objectproperties
• byte - MipMapCount
• each MipMapCount
  • if (Version >= 63)
    • long - WidthOffset
  • index - MipMapSize
  • each MipMapSize
    • byte - MipMapValue
  • long - width
  • long - height
  • byte - bitswidth
  • byte - bitsheight