Daymn! That's lovely work! I wish mine looked that good. I like the vinyl flooring, too! Low-maintenance; No need to vacuum- Just have a little counter brush (that even works on my carpet) and wipe if needed.

Quick thought on auxiliary fuse box.
Auxiliary fuse boxes are typically not switched. A switched one would require a very thick wire to run to the cabin, to a high-current capacity switch (expensive, and maybe hard to find), then back to engine compartment, OR relay with its thinner control wires running to the cabin, to a lighter-duty switch, then back to the relay in the engine compartment. Too much trouble.

I would simply:
1) Determine what circuits and what current load they would have to put on the auxiliary fuse block,
2) Mount it as close as possible to the battery (I have a 4-circuit Blue Sea fuse block but had been too busy to install it).
3) Figure out main wire to carry that total current from battery to the fuse block,
4) Put a fuse or fusible link, inline or mounted as close as possible to the battery on that main wire. (Similar to the fusible link on our 22R-E's).