So the first step in laying out a new floor plan is creating a template to sketch out ideas.
I searched online for a while, but ended up making a template out of the original manual’s layout and a piece of graph paper. Here it is if you want to download it (click image for hi-rez PDF):
I removed everything (beds, bathroom, kitchen, etc.) except what might be kept, like the battery compartment and water heater location. I may end up changing those too, but I decided to leave them on the grid.
Scale is one square to 6″.