I am currently building a ATS and I am trying to replicate your build quality as much as possible while changing dimensions just a little. I already had the heatsinks, LED's, Acrylic, and of course PVC (Adult Lego's). My question is for the Tapping of the acrylic for the threaded holes on the input and drain holes. What is the size and where did you get tap & die (specifically the bottom drain) which I think from the videos is 1 1/4 pvc. The input seems to be 3/4 correct. Lastly what type of union are you using on the spray/drip bar that you can just screw in and out the compression fitting. I hope you understand imitation is the sincerest form of flattery.