07-11-2012, 03:49 AM
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Stop! Plexiglass does not permanently bond with silicone. It will eventually release itself from the silicone's grip and you'll have a major problem.
Glass is best as coydog mentioned - and it should be attached to the glass panes under the plastic frame, not onto the plastic frame, because silicone will again possibly have issues bonding to the plastic. You're looking for a glass-on-glass joint with a bead of silicone in between. 1/4 inch glass should be ok as mentioned, and I would make it at least as wide as the original plastic brace.
The alternative would be to fashion some piece of metal like one of the previous poster has done.