Pic Five. Here is the interior with the one-piece floor installed. I used 11/16 plywood that was on sale for about $12. I painted the bottom of it with two coats of enamel based Kilz, mostly because I had a gallon of it already. Time will tell how it holds up. Cutting the angled floor was a bit tricky. That Norm guy on “This Old House” makes it look easy. They probably edit out all the times his cuts don’t fit. After a few recuts, it fit into place. There are two 3/8” bolts on each end of the floor holding it to the frame, and the sides are screwed into the floor. Between the floor and the metal frame, I used strips of an old floor mat to fill the gap (the floor sits on the metal frame along the sides, but is 1/16” - the thickness of the metal - off of the center cross braces. You’ll see what I mean if you ever attempt this.)
Pic 4
Pic 5
I caulked around the edges and added small plastic quarter round along the sides.
Pic Seven. From the front. The wooden block under the box point is screwed into the floor from the inside. Note the aluminum strips at the point and the two sides. These are channels for hanging ceilings. I punched 5 holes on each side, then with a block of wood and a hammer, hammered the 90˚ angle a bit wider to fit the angles on the trailer box. It was pretty easy. Then I took pure silicon and ran a fat bead down the inside of the aluminum and stuck it in place. 10 pan head screws later and it was done. The metal was white to start with, so I installed it after the paint job. I will eventually put these metal strips around every edge, top and rear, which will be easier since they won’t have to be bent.
Pic 6
Pic 7