Sorry for the low-contrast background. I'm too lazy to redo it. :)
Red lines are front and back armor, probably just pieces of polyethylene.
White bulkheads are 3/16 UHMW polyethylene (3/8 pieces sliced on the bandsaw) that form both the drivetrain supports and side armor.
Light blue background area is where plexiglass will be added on top and bottom to protect the electronics.
No clue yet how I'll fasten it all together. :(