Great write up. I am doing one on my current project with a single bag but it's big about 4" in diameter. I am running a compressor because I want it to go down when not in use. Does you system have a bleed down into the tank or is it up all the time? Here is a picture of mine now, not quite complete. Sorry it's the only current picture I have you can barely see the compressor behind the battery. I would like to get rid of it if I could figure how to have a closed system that I can empty the bags when parked.