This is the start of putting up some walls in the bus. I made a platform for the bathroom, over the wheel well, and started partitioning the shower.  I also punched a hole in the ceiling for the flexible tube that serves as the composting toilet vent.

Since the shower walls don’t line up with the studs, I had to add some wood to the exterior that could anchor them. I also did that at the top of the two main support beams. It’s not moving.