Review my 72 bow stand SUMP design

[brosher]

Looking for some feedback on my sump design for my 72 gallon bow front. It is an interesting cabinet shape due the cabinet having a bow front as well as the tank. This design takes up most of the cabinet and would hold about 32 gallons at 16" high, not sure what the usable volume will end up being.

http://reefcentral.com/gallery/data/3984/94820sump_design1-med.jpg