[NickE]

This electronics layout looks ok overall. However, putting both the battery and the compressor in the same corner of the robot might be something to reconsider.

Where are the speed controllers and relays? It looks like the only space for them would be surrounding the main breaker, but I'm not sure if you have other ideas.

Also, it looks as if the wiring on the left (front?) half of the robot will be rather messy due to the lack of space between components. I would recommend rethinking your layout on the front half of the board. One idea would be to place the power distribution board closer to the battery. It is always a good idea to minimize the length of power wires. Having the large wires go from the battery to the front of the robot, and then having 10 gauge wires run back to the back for the speed controllers is probably not the best, especially due to the congestion it will cause in the front half of the board

EDIT: rtfgnow beat me to it, at least on my last point.