UPDATE And we find out that it leaks between the panels during rain. We're having a terrible time building this. If anybody that's already done it could help us that would be great. The instructions show the R1's being installed at the very last and we can't figure out how to do that. We can't reach it because everything else is already installed. Unless we go underneath and try to cram them up in there. Please share your experience if you've built this before.