Sheeting the WeekEnder

I've got approximately 3 weeks to complete the WeekEnder for the Nascar Bristol Race. I'm sheeting the outside and running into a slight complication. Where the angles change in the roof line I have two spars on each side of the angle change. The problem is how to tie the two spars together so the butt joints of the sheeting do not flex and break my seal, which will be silicon and epoxy putty. I did not think of this until I started mounting the sheeting and the two panels flexed. I am thinking of using small 90 degree angled brackets and benting them to the proper angle for the two pieces and then using them to tie the two spars together. This should make it more rigid and hopefully move together and not break the seal.
My goal, now, is to make the WeekEnder useable if not complete by the 23rd.

My goal, now, is to make the WeekEnder useable if not complete by the 23rd.

