I believe I just cut the screening to size and layed it in there, no screws. The cowl panel holds it down, it wont go anywhere.

 

Don't you need to get at some screws to get the cowl on and off?

 

OK, I think i know what I'm going to do.
I slid three smaller pieces of mesh under the windshield trim then used a magic marker to trace the forward edge where it meets the hood.Then cut the three pieces to size. I'm hoping I won't have any problems sliding the panel back in place. The 5 screws that hold the panel will also keep the screen in place. I may have to trim the edge under the windshield more, maybe leave just a couple of tabs to keep them in place until the cowl is down.
I'll bee doing that later. It's too hot to work on the truck right now.
I'll keep you guys posted.