Re: Small/flat but powerful motors
 

Just make a robot that's maximum frame height is slightly larger than the largest thing you need to fit inside it (presumably the battery), and use 6" wheels.

Then you can flip and your wheels will always touch the ground since they're taller than the frame.

Re: Small/flat but powerful motors
 

I'm actually pretty set on the design of the robot, but until I prototype it I won't be able to see how practical it would be in a competition.