One thing our Team(422) has done is a modular Circuit board that can be easily removed in about five minutes. This was for mechanical issues and at the VCU regional this year it allowed us to get to our motors and save a gear bfore it died.
For a box i would recomend looking at pictures of the insides of computers and looking at how they are set up:
-Bundled wires are your friends for organization
-logical placement and no wiretangling is a must
-COOLING chips create heat, motor controllers create heat, LET IT GO SOMEWHERE, FIRST gives you muffin fans use them! if you don't cool a box your victors may shut down on you because they got too hot during a match.
And if u have some extra wieght make a water cooling system and cooling blocks, I'm trying to get my team to do this but its still a no go
