Plywood glass on the inside and out is the ez'st cheapest method. Or you can build a mold out of MDF and layup your own glass . . . that is real EZ too . . . but more expensive. Probably cost $300 per seat in materials if you go all glass and build it yourself.
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I just finished my bracket . . . just have to prime and paint!!
http://www.wellcraftv20.com/gallery/...127&page=1