>>1040856it depends on how difficult you want to make it.
personally I have insulated, soundproofed, ply lined, put a floor in, trimmed bulkhead, carpetted trim, etc, all by myself with no prior experience.
pic related is from the other day
next job is to lay a vinyl floor now that I've done the edging on the ply floor.
then a split charger system and a 2nd battery, after that it'll be a few things related to it
I've decided not to bother with complexities, I don't have space for a shitter or anything.
I'll get a cab heater for next years (scandinavian) adventure
still deciding on whether I want a bed bed or whether to go for something else.