take a peace of paper, regular copy paper, set in under the roof when you get it all put in. close it and latch it, if you can do that and the paper is so tight to can't get it out try it in another spot and another spot all the way around the glass. if it is tight in all the places then its fine.
If its to tight to latch the glass you don't have enough shims, if its so lose the paper pulls out easily you have to many.
or maybe its the other way around, I forget. last test take a garden hose with no sprayer on it and run some water over it, if it leaks its to lose, if it doesn't its just right.
Steve
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Technology is great when it works,
and one big pain in the ass when it doesn't
Detroit iron rules all the rest are just toys.