Anything's possible! I remodeled my 72 Overlander while living in it, on the weekends. First weekend was a dilly--took out the twin beds, cut the tub in half, moved the bedroom wall aft 18", installed a double bed with storage underneath. Improvised a seal between the new shower (on half a tub) and wall which hasn't failed in 5 years.
The rest of the work was slower, but making the tub shorter (and thus moving the bed aft) and rotating the sink 90 degrees opened up a lot of countertop space in the kitchen.
One thing's for sure about camping--if the sink, toilet, fridge, and bed are functional, you can camp. It doesn't have to be pretty (unless you're married, then you only have to promise it
will be pretty).
Zep