doesn't specify thickness or mounting method. 1/4" for a windshield sounds good to me. I would (and have) attach the windshield to the stock bed with 10/32 or 1/4" countersunk allen bolts with washers and nylok nuts on the backside. "gluing" isn't going to keep that thing in safely, IMHO. Don't forget the retaining tabs and/or straps required by 3.U.
Your characterization of the discussion of the rules as "nonsense talk" might reflect the nature of discussions on message boards, but may be offensive to those who take safety seriously. vic