After going through a skoolie build to about 80 to 95% completion, here's what I would do differently.

1. Don't tear out the wooden plywood floor to get rust underneath.
2. Don't tear out side metal to replace the fiberglass insulation underneath.
3. Consolidate the plumbing in one area in case of freezing accidents. (It's no fun tearing out half the bus to fix busted plumbing).
4. Place woodstove in middle of bus rather than at one end.
5. Get bigger woodstove than a cubic mini.