It was a full sheet of aluminum that I had the inside cut out and any good glass shop will then make it to fit the opening. As far as driving - yes in dusty conditions and I do know that dust will get in the cab if you don't have the venting. On both sides of the windshield there is about an inch opening which I am hoping is enough to prevent some of that. The lexan windshield I had on it prior fully enclosed the front and it still wasn't that bad. The small openings should help some and If need be I can add some holes but I don't have a lot of area around the windshield to go 4" that is for sure. Also, I put some more pictures up in the gallery and a couple of them show the clamp very well. It does have rubber inside that wraps around the tubing. They are very similar to the ones on Extreme Metal Products for sure. No hinges on the windshield. What you are seeing is hinges for the front hood.