I can tell that a lot of thinking went into that table and the accessories. I too wondered about the flatness. But, that guy looks to be way ahead of me skill-wise, so maybe he has it all taken care of.

I'm a long time self-taught hobbyist welder. I started with a Lincoln 225 Crackerbox at 13 years old. Nearly electrocuted myself wiring it straight into the breaker panel. I'm now pushing 64. I've welded all kinds of things from carbon steel. Lately, I've bought a TIG setup and am learning to use it...