Yeah, trussing and triangulation is the way to do it, no question about it.
I finally found a local steel supplier, offering darn good prices for square, round and rectangular tubing, as well as plate, angle, rods, all the normal stuff a hobbiest would want access to.
15 minutes from the house, free cuts on orders over $150, blah blah blah. So for my engine test stand, I simply had them cut everything to fit, and all I had to do was whisk off any rust (bare steel rusts quickly) near the edges, rough up with a grinder, and weld.
Same for the studio table.
What I really have to do is figure out how to make it more of a bolt-together, so I can weld outside on the driveway, then bring it upstairs in pieces, and bolt together. The advantage of welding it together in the room is simply that its 12' wide, so if I use the round tube to cross the span, and lay the mixer fronts on them, the likelihood of it being straight and level is very high. In sections, I just know its all going to be a hair off thus lining up the little mixers is going to be a real pain.
Time to play with visio, for sure
Awesome picture Rick, I'm going to steal from that one too.