If it's got an open back, like it looks in the pic, see if it's got a wide enough space for a 55 gal sump. It looks like it would work if you install it before the tank is put on top.
Thats what I was thinking, or three canister filters but I am trying to take the easiest route. Only question I have about the sump would be what would I do for the intake or "overflow". I will not drill the tank and the overflow boxes you can buy wont fit because of the acylic ledges that are I believe 4" wide plus the wood trim. Would I pe forced to do canisters at that point?