Your approach isn't entirely unfamiliar to me. You are, basically, my dad. He had a never ending succession of bangers maintained on the cheap, although tbf he probably wasn't as canny as your good self.
I remember one afternoon that went like this:
- Dad and brother go to scrapyard for a replacement fuel tank.
- Bring tank home and remove vapours using a match.
- There is a very very *very* loud bang.
- Dad and brother go to scrapyard for a replacement fuel tank.
That said I'm planning to go to the scrappy myself at some point, just for a general nose. Commercial vehicle scrappy, now that's a good idea.
And yep, the position of the standard fuse box is pain in the ar$e when it comes to adding new kit that's going to be installed in the back. The simple thing is go straight off the battery, and all of a sudden you've got a fistful of inline fuses. Nothing wrong with them as such, they work, I just hate the DIY look I've ended up with.