Ewe 2 in series 7 and Ruff Ruff Dougal in series 5/6 didnt have a base panel either, and you didnt give me the same grief about My Grain which also didnt have a base panel. In cases like those, innards are mounted to the chasis. You can actually see that when Gemini flipped up Dougal.

I also said in the rules you dont have to state what powers your weapon. It helps, but you dont need to state it, and lose any right to complain if I decide it burns out :P