Been there, done that on both accounts.Im excited to see where I go with my project too, but currently learning about how the **** a rivnut works if that tells you where Im at. Ive wired a fair bit of my house, but seeing your electrical setup has scared me to the point that I understand why people buy goal zero's!!
We did a few test Rivnuts before diving into the Sprinter work. And it all seemed so weird to drill holes and squeeze those things in to them. But it was almost surreal how fast and easy it was on this second van (also having done two other friends' in between). We'd talk about what we were trying to do, do it, pull it back apart and re-do it, re-think it again, then be pretty close to what we'd envisioned by the third attempt. Except that took a few hours this time instead of a couple years like the first time.
The wood-back attachment method started with MUCH larger wood panels to mount the 8020. Then we realized that was going to create a different set of problems. Unbolted everything, re-cut the wood, remounted everything. Sounds annoying... but to do the iterations and get it all done in a few hours and see the objectives come together was very satisfying.
Similar with electrical: took a long time on the first rig - and a lot of swap out of things that didn't work as planned. Did 2 or three other rigs in between after figuring our first one out. So this one was one day to get the truck power part up and going (cabling, ground, breakers, inverter, fuse panel). Then two months later, did the house system in one day. It went so much faster than the first time - knowing much better what we're doing and being confident it would work.
I may not be in the right position to say so... but it's mostly simpler, safer, and easier than it seems. It's the act of doing something new-ish that makes it tough. As the old saying goes, well begun is half done. 😊