i was "sniffing" around on craigslist. came across a pc of glass bout an hr from me, "Table top is a beveled edge rectangle - 42w X 72l & heavy meant to be a patio table" the woman said its about 1/2" thick. just wanting to make sure thats plenty for my ply build. its 70x46x25. the veiwing window cutout itself is 21" x 61 3/4". hope it works, would save me a bit of money - considering i got laid off yesterday 
but they didnt post a phone number only an email and haven't got back to me yet.