Yea its been a while - like I said in my PM to you lonestar, without this addition my tank would have never survived the summer. Usually running at 1-4 F over ambient room temp (without the cooler) I had apt temps over 90F while my tank was a cool 82F.
To address concerns of water spray out of the cool air part of the tower, I duct taped some saran wrap above the tower to keep water vapor (and microdroplets) from condensing on my presswood stand. I also added a temperature monitoring system to improve the design. I plan on switching that over to a control system soon. Right now I have the tower on 12 hrs a day using a timer. It would be a bad addition if someone doesn't have an autotop off because this thing evaps a lot of water. It also doesn't work so well in high humidities (75% +), so at those times I crank up the wall AC unit by the tank and I think the tower helps to mix the cold air with the tank.
All in all like I said - no tower - no fishies - this summer so I think it was a great addition, I hope everyone who can't afford a chiller (and needs one) will build one of these to save their tanks. There isn't a concern with a cooling tower blowing out a compressor on a hot day or sucking up kW after kW of electricity... this is as simple as a crappy pump and two crappy fans.
good luck - I will post further additions when I complete them.