i whipped up this one for my sons boat last summer in a couple hours from stuff i had laying around (bow railing parts and used plexiglass)and some aluminum channel for the outer frame from home depot
it is not fancy but i dont think it looks horrible and is very functional and has been very high speed tested while driving last summer on the outskirts of a  tornado .

On a metal boat?? Travesty!!! 

Actually, It could look ok if you keep it light, design-wise. 

Wooden frames were used on wood boats all the time. If you wanted any type of curvature to the windshield you would have to steam bend the pieces. Steam bending is a lot of fun, you just have to move fast.

Or if you wanted to just make a three piece set... one left, right and center, you could cut something out on the band saw quite easily.

Has anyone ever used wood for windshield frame?