So, I determined that free-hand measuring this amp/battery rack is going to be impossible. Since I don't have the tools to make it here, I've decided to mock it up with cardboard. It's going to be a tiered design, batteries/fuses/all excess wiring on the bottom, and the amps on top enclosed in a hinged box, with fans on each side in a push-pull configuration and a removable top that's secured with magnets. The top will have plexi on it to show off the amps, and my DC 5.0k will be mounted upside-down (I made a plexi cover). Pretty sure I'll be putting some lights in there too. No one is going to want to build this when I'm done mocking up lol.
Here is the space I have, with the seat removed:
Here are my G31's:
And here is where I stopped for today:
Was pretty nice out, decided to go for a run.
If anyone has any ideas, I'm very open to them.