What clamping is best for homemade windshield
 

I'm planning to make my own windshield and already have some of the clamps used on hardtops. Not sure if thread's something better out there, so I'd like to hear your ideas on mounting Lexan. I was thinking slotted holes in the shield might help with flex.
Has anyone used a UTV windshield clamp kit for this kind of setup? Curious what's worked best for you.