Dug these out today. I had to disassemble a few so that I could move them myself but the tops pictured all have heavy gauge steel frames for them and are simple bolt-together affairs.
This one is pre-wired and as far as I'm aware, all the "electrics" are in excellent working order. This one measures 72"L X 29"H X 30"D. The top shelf is 72"L X 12D and has 16" clearance to the main work surface. Both electric "towers" have independent cut off switching and wiring.
A few of the tops.........
