Sounds like we will have almost the exact same setup. I was looking for a place to put the fuse block. I might stick it in the read storage compartment next to the rear passenger seat. I haven't looked under the drive side dash yet. I'll poke around a bit for a nice, easy access, location. I did this same setup, sans the Redarc, in my FJC. PLus I included a solar panel to recharge the battery. That made it really nice to go camping and not worry about killing the starting battery.
Electrical illiterate. Try as I may, I cannot figure out how people are wiring their 12v systems. I like the idea of a dedicated 12v system. Would you mind drawing a wiring diagram of your setup? Pictures I can read, words not so much.