The Fish Tank or Live Rock Aquatics can order custom glass aquarium planet Aquarium tanks. I think glasscages out of Memphis area makes custom acrylic. I bet they could provide a quote.
Trigger Systems who make a great line of sumps will also build you a custom sump built to your specifications. I ordered mine from them and have been very pleased with it.
Hard to find anything for reefing in this state unfortunately. Jeff at Lifereef builds great quality custom sumps but he is out of Colorado. Sorry thats the only info I have to contribute to your question.