Hey, Kelley! Just remembered something; when you buy your window material, go to a glass supplier and get at least 1/8" or thicker Plexiglass material. The stuff sold at Home Depot is only .094" thick - not even 1/8" and it's too flimsy.
I'm running .125" and it's OK, but that's about it. Wild Bill Drayer is running 1/4" and I think I'll be going that route when I make new ones in a few years, as it is far more resistant to "bowing" out at higher speeds. since you'll be looking for weatherstrip matrial anyway, might as well go for the thicker stuff.
Also, ask the glass person which is a harder material, Lexan or Plexiglass (Both are harder than clear Acrylic) and go with the harder, more scratch-resistant stuff - worth more money in the long run.
Either Lexan or Plexiglass may be bent by heating with a heat gun (NOT a hair dryer; you need at least 1200 watts. Just don't try to rush it, and it'll keep from getting wavy). I contour-bent the lower leading edge of mine to conform to the shape of the windshield frame, rather than mess around with re-bending the peg mounts (I was under a time constraint to start a migration and the heat gun was handy, but bending the plexiglass or the peg mounts will work).