As I stated previously, trailer weight is not an issue with me so I'm probably offending some of you by overbuilding nearly everything. Since the floor and cleats are critical to securing the entire superstructure, I used 2X4's on the sides and 2X6's on the ends. I beveled the edges of the end cleats about 33 degrees to match the bottom bevel on the weekender body. Since I couldn't find 4X10 plywood anywhere in the Southeast, I bought three 4X8 sheets of 3/4" cabinet grade at HD and spliced enough to make my overall 10' length. I decided to make the splice in the center of the door opening so I have just a really short section top and bottom to sand smooth. Cutting the walls was pretty much straight forward and I used the inner ring from the Vintek manufactured doors as a template for cutting the door opening. Again, I developed several "third hands" to help set the walls in place and to install the spars. I applied two coats of Zinsser primer to the bottom edges of the walls and the ledge and cleat where the walls fasten. Also applied a bead of silicone window caulk along the bottom of both side cleats. I installed most of the spars on the front half to start firming up the walls, but left my temporary cross bracing for now.
All cleats fastened to plywood deck with 1/4" bolts.

Ends of side cleats and sides of end cleats beveled 33 degrees to match bottom bevel of weekender body.

Gluing lap splice in plywood.

The corners are cut. Starting to take shape.

Inner door ring used as template to cut door openings.

Primered and caulked ledge and cleat.

The walls are up!

Third hand used to hold walls in place.

Third hand used to hold spars.

Spars installed in front half.

Rear view of walls and spars.

Another third hand for temporary wall supports.
