[DonRotolo]

I am sorry to be so spectacularly unhelpful, but at this point (tomorrow is bag day) you're in a lot of trouble. The bottom line is this: Which is more important, the <whatever> mounted atop that plywood at the rear, or battery/roborio/power/etc. The team needs to make a hard choice, today. Again, decide what is more important, because you can't have it all.

Radio needs to be up higher, not down in the belly. Ideally not mounted to aluminum either.

First step is finding a place for the battery, then the PDP, and then the RoboRio. Be sure the main power switch(120A breaker) is accessible.

Second step is putting everything else wherever you can, including upside down, vertically, and so on.

Lastly, wire it all up.

Best of luck in your decision.