Yeah, I would also probably get it in acrylic and the costs are pretty crazy. But then I think I have had my turtles for like 15-16 years already, so maybe I should just go ahead
Anyway I kind of feel $400 is a bit high, but then again its not standard dimensions for a tank. One thing to keep in mind is that it will be harder to go in there and clean up, though you're probably taller than me.