google custom aquariums or diy aquariums will more likely bring back descent results. most likely you should look to various companies that can make what you want. but the price is going to skyrocket.
you might also try
window site:koiphen.com
there be a few folks there that i know did a DIY windows on there koi / goldfish ponds. there should be some build threads on some of the ponds.
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if tank was ever put in public area (such as a business) the glass/acrylic or what ever it is made of, wil sky rocket again in cost due to thickness it will require. someone going up to it and tapping it, leaning against it, etc...
some of the materials out there can scratch more easily from cleaning pads or like to remove algae growth on them.
