That stand is incredibly well made I think! The way you've sandwiched the plywood together must make that thing ROCK SOLID. One suggestion (might be too late) would be to use stainless pipe handles rather than knobs. That way you tie into the steel pole on the other side of the stand...bringing it all together. Strictly my opinion. Love what you're done so far.
How did you skirt the bottom? Is that metal plating?