I replaced the floor with the frame in place under the shell. Actually I removed the floor in parts.
First the front section where the frame was rusted and broken and poorly patched in places. I built a new front end from the "front of the lower floor by the door. I also added the structure for a new modified bath.
This is what it looks like from the front
Here is a picture of the main floor and the rear floor installed. I need to finish the new wheel wells and prime the steel and then fiberglass
them and the plywood floors that go on either side.
I used 3/4" ish exterior plywood and fiberglassed both sides and edges with 6.5 oz.yd fiberglass
and epoxy resin.
I also used structural glue to seal and bond the plywood the the primed frame along with screws through into the frame.
I am considering also fiberglassing the finished floor to frame junction because SHE WHO MUST BE OBEYED wants no bugs crawling in.
Towards that end all openings are to be sealed and tight!
Make sure you have the shell aligned with the frame and the door geometry correct before you measure, cut, install, and fiberglass
the floor panels