Mine is home made. Used a piece of cardboard to make a template for the glass shop. What I would do differently is make my windshield go out past the roll bars instead of fit between them like mike does. It tends to hang between them instead of rest on them.
to the OP, I agree make it go over the roll cage. Just simple cable clamps to bolt it. use a heat gun to bend the plexi at the bottom. I didn't do the bending, and it is difficult to open hood, but not impossible. Also I used some plexi I had around, not quite tall enough but does the job, wish I had one the right size, as rain and cold come in the top