Yes, I think the original design may even have been published by Black and Decker. The key is to not go with the very lightest of the Work Mate designs... some of them almost seem to be made out of beer cans while others are quite stout. The one I got is toward the lighter end of the spectrum and when I inherited a MEC 600 Jr that was already bolted to a 2X2' piece of plywood, I just attached that with a couple of C-clamps "temporarily" until I got around to making the other top module for a metallic cartridge reloading setup. That was at least 4-5 years ago and the MEC seems to have taken over that W-M by default. I guess I'll have to find another one to do metallics. It really was meant to have interchangeable (modular) tops when I started though.
Froggie