hi! welcome fellow new yorker
I'm not sure who around here does custom tank construction, but I know that Aquatic Creations in Williamsburg does custom installs (may include tank fab) and so does New World aquariums here in Manhattan. Might be worth giving them a call to ask!
Are you going for a frameless tank?
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10gal / Endlers, Cherry Shrimp, Otos / Filstar XP2 / 8wpg PC / 2.5lbs of Co2 / Hydor inline
20gal Long / Red Eared Sliders / Fluval 404
5gal / More Endlers! / Duetto 50