they have to be easy to remove Id make my own if I could find the quick release brakets that fit the stainless rail

I thought about using these with a sheet of plex inserted
into the top

Try these guys, they run them on their boats and they work great my buddy has them on his.

http://www.warlock-powerboats.com/29_wc_1.htm

What is the diameter of the stainless rails you want to clamp on to?

There are a few places that advertise in the back of the boatings mags.

http://www.finneys.com is one of them. With that rail that goes around your windshield it should be easy to rig something up.

Finney's makes some stock ones that will clamp onto the rail. If you replace the hardware with some studs and wing nuts you could take them off without tools.

http://www.finneys.com/

The ones on my Warlock were made by Finneys. There the OEM supplier for most west coast boat builders. Its a 5 min job to take em off and on with a phillips screw driver. They come with the brackets and will make up almost any size plexi you want.
Dan

PM me finneys is in havasu send me some pics and I will walk them in and talk to the boys.

They do supply most of the windows and plexiglass doors and such for most of the west coast boat mfgs.

Will be glad to help going there this weekend.

949 233-0908 Jeff