[wireties]

We use polycarb to mount the electronics (thicker stuff for cRio than for the motor controllers etc) except for the battery. Lately our sheet metal sponsor is making fancy battery trays for us but in years past we used aluminum angle to stick-build reliable battery trays.

Being flexible with the battery location is a plus. If you can move it around a little (as the last design step) you can get the robot's COG just right.