Got a ton done this weekend
furnace and water heater installed
bathroom walls are up.
Rear wall/bunk are finished. the bed and walls are stressed skin with a wood frame and 2" insulation inside them. With the bunk being 66x96 and only supported on the edges it is crazy rugged and pretty light. it is a 2 person job to install, but it is pretty easy. For sheathing we used 3/16 subfloor material from home depot. it is easy to work with pretty clean and knot free.