There are only a few skim coats so it's not that heavy. The iron pipe makes up the bulk of the lid weight. Check this link for more info on the lid. https://www.homebrewtalk.com/showthread.php?p=6883899
I chose this.fan because it has an adjustable speed control. Thermaltake Mobile Fan II
External USB Cooling Fan - Us https://www.amazon.com/dp/B00080G0BK/?tag=skimlinks_replacement-20
USB computer cooling fan with a 12" piece of copper pipe along the beer lines to circulate cool air through the insulated tower to prevent foamy beer. I fastened it to the lid to eliminate possible kinks in flex tubing, increase floor space for kegs and eliminate any sort of electrical issues...
Thanks for the compliment. I used liquid nails and screws to adhere concrete backer board to the to and sides of lid then applied three coats of concrete skim coat mixed with black pigment. I had intended to sand it smooth before applying the glossy sealant but my 15 yo. son suggested I should...