DIY Sump/Refugium

Ok all you DIY'ers I need you you help here, I'm pretty good with tools and have done some DIY work to my tank already but now it's time for a new sump and I don't want to spend 4-500$ on a new sump when I have to buy a good skimmer too. I want to convert a tank into a sump Refugium but I'm not sure what the best way to do this is, I want a big enough chamber for a good sized fuge but I also want room for some filter socks and then the return chamber, I also need to know the best place to put the skimmer, can it go in the same chamber as the return pump or how does that work? Thanks for you help guys... Oh I'm looking at using a 29 gallon tank or maybe a 20 if I can't fit the 29 under my tank