Breaking news! Just got a pic from John at Advanced Acrylics in CA. My ATO is done, he is working on matching dosing containers. Here is a pic he texted me. He nailed the color combo (I asked him to use his judgement, full autonomy, after he saw my build pics). Can’t wait to get my hands on this. The hole on the left is for RODI float valve. Since the tank is small, I will simply connect and refill the ATO once a week, instead of having a permanent connection. The depth is 15 inches (due to Red Sea hinge on the right of the cabinet). The dosing containers are 3 inches wide and will sit between the ATO and sump.