Chuck,
I like it, and was recently trying to come up with something that was portable and could be moved around, I don't often need to take it anywhere, I mostly wanted to have it portable so I could pack it up when done with it, and get it out and set it up when I need to work.
I'm not totally decided yet, as my table mods were kind of interim, I really want to get a Certiflat table and not sure if I will incorporate it into a mobile stand, but most likely yes.
First I am making a welding cart, and keep thinking if it would be useful to try and incorporate a flip up work table using a Certiflat, or just store the Certiflat on the welding cart for storage, but the most likely scenario will be to build a mobile cart base for the Certiflat (*WHEN* I get one) and leave the welding cart separate for the welder, argon bottle, torches, electrodes, filler rod, etc...it's more likely I would need to take the welding cart with me somewhere, and even having a small 12x12 plate could work to flip up as a small welding stand.
I currently have several different vises that I can use clamped on my small welding table, a simple drill press vise, a small metal vise and a pipe vise I rarely use. I have a couple more, but they won't do too much more for me...although a leg vise is handy, I have one of those also...
Anyway, good solution for a portable vise stand that you can even weld on, like most tools it will work for some stuff and not other stuff...that's just the way it is...
Alan