I'm interested in one of these exact ones myself - just ran into their youtube of some guy building one using 8-8" bolts & a few 3' allthreads to hold true while tacking it up - I threw good cash at a good push-pull & want to fixture the AL pieces I cut out.
I'm not looking to get one prior to the new year, but these were the ones for the $$ I'd seen, aside from a decent jump to the other one (BuildPro IIRC).
Post back what you do, or any here who have the tab/slot - weldtable.com
Edit:: OK, just talked to BuildPro - I like but can't justify the $$. -- 5/8" plate looked awesome & the fixture tools are so handy looking, but I'll have a Dynasty 280dx before a BuildPro (so never, my little Econotig will be it for TIG in my shop unless I get a massive tax return) /Edit