Here is a better shot of the interior.
This is a shot of the new 3/4" floor, and the method used to attach frame to body/floor. Note that I also filled in the entire perimeter (the gap left between the plywood floor and the figlass body) with epoxy, to the level of the floor. The seams between the three floor sections is also epoxy filled.
This shows a bunch of details. First, I had a section of plate steel that went from the back of the frame to the back of the bumper. This was to support rught under the door sill area. But, I was worried about water pooling in this area and rolling under the door sill, between the plywood and the
fiberglass. This area is probably the worst design element of the compact Jr. trailers.
To fix the problems, I made two changes.
Fist, after I installed the new plywood floor, I fiberglassed from under the trailer's existing
fiberglass and wraped it around the plywood, and into the trailer floor about 4 inches. You can kind-of see where the fiberglass ends in the left corner, because of the sudden lighter color there. This will insure water can't get between the fiberglass and the plywood, and I think it's a simple must-do modification to any Compact Jr.
Secondly, I removed that section of steel plate that went from the back of the frame to the back of the bumper, and replaced it with a section of angle-iron that ends right under the door sill. This way, water will tend to just drip down to the ground now and has nowhere to pool.