I mostly followed a write-up from another site to build my own version of the system. As of right now, I have 5x 40 longs, 6x 20 longs, and my 180 on the system. Plans are to get two 150's on the system as well as a few 10 gallons once that half of my fish room is set up. the 20's get 0.5 gph (about 40% water change daily - more than I want, but .5 gph are the smallest drip emitters I could find and I'm not going to put a timer on this thing), the 40's also get 0.5 gph (about 25% daily, 90% weekly). and my 180 (with 60 gallon sump) has 5x 0.5 gph emitters for a total of 2.5 gph (about 20% daily, 80% weekly). I had to install a whole house filter with a carbon filter to remove the chlorine as early tests of the system wiped out a batch of fry. Overflows are very simple PVC and vinyl tubing which all drain into a hole in my floor and out into the ravine. Plans are to set-up some kind of collection system to water the garden, but that will have to wait until spring. So I still have to vacuum crap out of my tanks, but I don't have to worry about keeping up with water changes anymore! which will save me a ton of time each week.
Here are some pics.
The whole house filter which for now is sitting in my fishroom "sink" until I can mount it somewhere.

The pressure regulator just before a gate valve....this is the second pressure regulator I installed, it's an agricultural grade one as the one from HD didn't work as planned. I also put this gate valve in to further restrict flow as even with the regulator, the pressure was still blowing out the drip emitters, the gate valve let me dial in the right pressure to the system.

One of the manifolds - this is for the tanks I haven't set up yet, and end in closed adjustable drip emitters for now. Each branch of the system also has a ball valve so I can make modifications to the branch without having to shut the whole system down.

The other three manifolds

A close up of the overflow: It's very simple, very cheap and works. The vinyl tube you see in the tank is the output, the height of the T fitting in the PVC determines the water level in the tank, this is the part that took a lot of adjusting and led to some tank overflow onto the floor.....

Three of the 40's overflows piped in

a pretty crappy shot of one of the drip emitters
