I've not built any tanks, but I've had tops cut at a local glass shop that's just down the road from my place. They told me that they've had inquiries about building tanks but they do not want that liability but they could get glass for anyone who wanted to do it themselves.
I'd imagine any local glass shop could order the pieces you want, and even cut them to size. You'd just have to put them together (and hope they don't leak

)
HTH
Jenn
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LFS Owner:
Imagine Ocean

Just keep skimming, just keep skimming, just keep skimming, skimming skimming! What do we do? We skim, skim, skim!