Got everything together and holy crap does it churn out the mist and move some serious air. I have just a 6' stack pipe on it currently, and with just a 90° on top, it spits mist about 4' out and will overload my hygrometer anywhere inside about 2.5'. The 3/4" reduction does enough to cut down flow that I think it'll be just right, however it will definitely require being set up at all levels to keep humidity reasonable.

Also, it does a hell of a job cooling the air in the system. With it wide open and temperature sensors near the intake and inside the stack pipe, there is about a 10° temperature drop. I may try an aquarium heater to bring the water temperature up and hopefully prevent the temp drop, but I'm not sure if it'll be anywhere near enough. I'll definitely be piping the mist in on the cool side so as not to drag the hot side down.

Hygrometer itself works great, exactly as it should. Now I just have to get the rack itself built so I can set it all up on that. Will be tough to really give the system a shakedown run till I get the temperature controller in as well, and it seems to be taking forever to get here unfortunately.

I'll get some pics of the individual parts used later on and see if I can capture the mist on camera.