Is your tank drilled or will you be using a HOB
It is pretty easy to put a sump together with a glass aquarium and some plexiglass panels and silicon from home depot or lowes. It took me an evening to put mine together for my reef tank.
Are you thinking about doing a wet/dry setup, or just adding some biomedia and some mechanical filtration on the inflow (i.e. a filter sock?). Are you thinking about doing some kind of FW
I think it is a good idea for a cichlid tank - though you might also just consider adding a canister filter - it would give you similar results.