I thought the plans were pretty simple actually. I have already built everything including the topoff system. The sump is a 29 gallon glass tank, the fuge is a 10 gallon rubbermaid container with a couple holes and a small rig to give it rigidity, the top off is another rubermaid 15 gallon trash can and the quarantine tank doesn't exist yet but that is just another 10 gallon rubbermaid container.
The plumbing from aquarium to fuge is just a 3 way valve and the fuge gravity feeds into the sump. Same for the quarantine tank which is the same line I am going to use to bleed water out for water changes. The top off uses a small pump and an autotopoff.com unit to feed the sump to a certain water level.
All in all it took me about a couple hours to put everything together. Course it isn't all running salt yet so I may have messed something up, but I think anything that is screwed up should be an easy fix. Also, I think this was easier than trying to build an all-in-one sump.