Trust kens designs. have seen them. biggest q is how much room you have and what you need to fit in there? to be honest, a refuge is sometimes better setup seperately but it all depends on setup. i.e. can you up a small shelf above the tank for the fuge> or is it in a bedroom where the lights are problematic? Personally, given the option, a fuge is better off seperate from a high flow sump for "smaller" systems (less than 200g). Can be quite a few creative ways to fit a fuge into a system, and all that is needed is a small powerhead feed and a bulkhead/gravity drain) but again is better to have an mixed sump system than none at all....