Thanks for all of the replies. I was curious if I should have been concerned with heating and expansinon in the hot sun. But, , , If Vans' says a perfect, zero clearance fit, that's what it will be.
I did use the Checkoway method of fitting the baffle, and I did end up with a pretty good fit. Actually, I used the Vans' method first, replaced all of the Z brackets, then used the Dan's method. I was a little unhappy with the fit to start with. Turns out, I had to readjust the the spar support to remove the sag. After that, all was well.