I am assuming that you are building a reef tank. If this is the case, what is the reasoning behind building a multi chamber sump? I see some flaws with this setup. One being that the chambers are joined with small pipes/tubing. If you have a block in one of these, then something within your system is going to overflow.
I have a sump in my freshwater setup, but the main purpose for me is to increase the water volume and get the workings out of my limited space in the main tank.
I would just go with a simplified design of a normal tank or acrylic sump with a return pump. You really shouldn't need a seperate chamber for the protein skimmer, etc.