I am about done with it.. I bought a messed up rig that someone started redoing and completely redid it. I got rid of the closet area area and put an enclosed bath with toiet in its place, Then built a closet area between the twin beds with a Dorm type electric refrigerator
at the bottom. To power it I installed a large inverter then installed a 30 amp voltage converter to charge the battery
for the rig. Installed a small tv with DVD and a Wave heater. We then made new canvas for the pottop and the wife redid all of the seating areas and window coverings. I put a storage box on the hitch and put a 40 watt solar panel
on it.. That is about it for now but a new stove and tongue jack are next. We weighed it and it came out to 1360 lb with most of the camping junk in it. We took it out and got about 17mpg with the first trip. It pulled like a dream..
Good luck with your retro job. If you like send me a direct Email and I will send you a couple of pictures..