i left the interior wall that separates the bed from the front portion of the trailer but removed everything else, including the rear interior wall and the wall between the closet and stove. the
fiberglass shell holds up fine without them while stationary but i will definitely reinstall them when i put everything back together. i'm actually also considering adding a wall at the front end of the kitchen counter to help support the
fiberglass because it sags a bit even with those walls.
when i removed some of the ceiling, i noticed that there is also a strip of wood glued to the fiberglass for the cabinets above the sink to screw into...
...unfortunately, it is off by just a little bit so the screws for the cabinet actually missed it entirely. i found the same thing with the screws for the skylight and its wooden frame too. i have to admit that the deeper i have dug into this thing, the less impressed i am with the craftsmanship that went into building it.