Cool idea but he's removed the best part about a Volvo IMO, the workstation/booth in the rear to make room for those overhead cabinets. Also, that waste water has to go somewhere. No way I'm going to want a waste tank on a truck, I've dealt with it way too much on RV's. Very few places to dump them and I bet guys WILL be lazy and dump them on the ground.
Just use the truck stops for showers and enjoy the space of a Volvo as is.