Molding acrylic plastic is not hard to do (I have made a couple of items this way before, but not a windshield), and the material is readily available, so I decided to try making one. This one has a slight compound curve (bend in two diections) but most windshields are just a simple curve.
The bike in the picture is a 2001 Honda Magna 750, with my homemade windshield installed. This type of windshield would probably work for most any bike. It is fairly small, and I did not see any need for metal bracing on the windshield. It is mounted with four struts of 1/4" all-thread, bolted through the plastic. It has held steady at up to 75 MPH (legal, here in Texas), with no vibration or movement. It has killed allot of bugs that would otherwise have been splatttered all over me!