there's been a couple, but the one that really stands out of DJ88's reactor build on RC. I used that one as the bare bones and looked at other design's from dealers. what I have is fairly compact but should be able to hold a whole jug of media.
the kids have come down with lice so my progress has slowed down. I'm battling the bugs currently with everything available in the stores, including mayonase and olive oil hair treatments. I can safely say the Merrick is the one mainly infected with susan a possibility, while Xander and I are clean. All i've got left to do is glue the top and bottom on my reactor, then wet test.