I made a 12 tub hatchling rack all in under 100 dollars in about 2 hours and I am NOT a 'handyman' type. I can share details on that if you'd like in terms of a supply list from Lowe's. The thing is solid as a rock and the tubs are snug.

In terms of the heat tape, just run it in one continuous piece and order it already wired (free from Reptile Basics). If you want to wire it in line it's not very complicated if you have the right tools to crimp the connections and follow all of the steps including insulating the connections with electrical tape, not fully covering the tape with something that doesn't allow for air or heat to transfer off the tape,etc.

GL!