If you are looking for practical, you want anything with a 4ft legnth and a shape composed of straight lines.
I personally dont like deep tanks, as it wastes a bunch of light energy, and IMO its a PITA to dork around with corals and things when the tank is deeper than about 24".
If you are willing to spend some $$ and get a custom sump/fuge setup built to go under the tank, and do a very quality job on all the rear mounted fittings so it will (always hope) be trouble free on the back side, then I think it could be practical from a maintence POV. Likely going to require MH lighting to do the goofy shape, which depending on your location and application may require a chiller unit (or evaporation cooling means).
Depending on your reefkeeping method, if you choose one that involves algae growth on the glass, it can be a PITA to try to use a magnetic cleaner on curved glass. If the curve is large enough it seems to work fine though, so that may or may not be a problem.
IMO, corner tanks are thumbs down, however, if you are willing to spend the money and time to set them up to work, it can be just as good as a rectangle tank.