Got my rack in last week, finally got the motivation to put it together on Monday. It wasn't difficult to get together at all, just took a bit of time since I only had a regular screwdriver and had to hand screw everything together. Got the heat tape in the grooves just fine, and I have all 3 of my BP's in it now. Haven't got my 4th one in yet, but she'll be quarantined in another room (of course) in Calypso's old tub. Emrys is just a bit big for these tubs, but when I get my 3 tub adult rack in a month or two I'll be putting him and Circe in it. By then I'll have a 3rd thermostat, which is the only reason I put Emrys in this rack for the moment.
My "reptile room" is in my walk-in closet, because I didn't want them in the living room where my apartment maintenance people spray for bugs monthly (they don't go into the bedrooms) and I didn't want it just in my bedroom, because it stays around 72 degrees year round (often colder in the summer) and I didn't want their ambient temp to be too low.