After reflecting on how I want to assemble the side walls. I decided to build the walls so I can just lay the headliner in the top, on ledges, then installing the spars over it. The previous plan was to assemble the spars, then push the headliner up into it. After reflection and look at some other threads, it is apparent that must be a pain in the a$$.
So I need to make some changes. I need to create that ledge all the way around. To measure where the ledge should go, I made a little jig. It sure aint pretty, but it worked really well. I used a scrap of spar plus a little piece of the headliner (1/4 ply). I used a bigger piece of scrap as the rail that will slide along the edge of the piece. Finally a cap to hold the razor blade. I started to use a regular razor blade, but it shattered when I tried to attach it. Finally I used a utility knife blade held in place by an assortment of screws and nails.
Again, not pretty but it worked great.
Here it is in action.
