You have a lot good work going on there. I got a kick out your mind changes on the firewall. I had mine done and painted so I could put the cab on.. put it on and thought " no way".
Now I like!
I fabbed a plate to mount my fuse block and with extra ground studs inside the firewall. But I also made backing panels behind the seat mounted on welded studs; for relays , terminal strips and you guessed it ,maybe move the main fuse block back there
Keep up the good work!