[warthog5]

I think I'd follow what Strick said, but just maybe use some solid stock Fir and cut it down to the sixe you need.
I'd also run it thru the tablesaw and have the side edge's cut at 45deg. That will let the glass conform real easy over them.

You could glue them down with some epoxy/cabisol and stick a couple of drywall screw's in them tempairy and then pull them after about 4 hour's.
Then just lay a few layer's of glass tape over them.