I think it's a useful idea for sure - we might even try it ourselves this year, so thanks for the thread and responses.
I've attached up a potential layout using
this enclosure from McMaster Carr, which has a clear lid so judges can see the lights. At 22" x 15" x 4", it should fit in a belly pan (depending on gearbox location), or elsewhere on the superstructure. Everything fits well inside, although you would need a separate enclosure / area for the pneumatic system. Fans, as suggested, should be added, as well as panel mount connectors for all the motors, etc.
(Open question: are we allowed to use a second Anderson SB-50 connector in the line between the battery and the PDB?)