Thought I would show how I made the spars. I was about to get some more plywood and thought I would just give this a try. I had a few 2X4s around and ripped then into thin strips.
The second part was to use the pattern that Mike had suggest be saved in the generic Benroy plans. I made a jig on a painted board so the glue would not stick. Drew the pattern and made the spars about 1 1/4"
I used glue, buttered on each strip and started to layer in the jig. Each spar is about 6 -7 strips. I saw some gaps when all the strips were in place, so I clamped them to take the gap away ang wiped off any excess glue.
I let each spar dry at least 8 hours. When I finished the last one I ran them trough the planner to get a nice laminated, even surface.
The finished spars were glue and screwed in place. The shape was perfect when compare to the back edge of the trailer. I took Gage's advice and built the rear hatch in place.
So, if'n the spars hold there shape, I don't think I will have any springback.
Now I gotta get more supplies.
I ended up enjoying this part of the project because it worked so well. The most dreaded parts of the build were the most fun.
One ugly part is that I used cherry stain on the outside. Looked terrible. I have covered it with kilz and now will be painting the exterior. Disappointed at first, now I am figuring different color combinations and that is a joy. I'll just have to come up with something nice as I am doing this build on the cheap.