Cool looking set-up, is the whole thing trans-fi/Teres?
I'm sure you have a whole lotta people drooling around here.
1)Is the rack stable? Can you push on one of the legs and move the whole thing sideways, or is it solid?
2) IMO, once you have a stable stand all you need is to put the table and motor on a platform that's decoupled from the stand. I would just use inverted cones, but you have lots of things you can try. Because you have the consideration of motor vibrations being transmitted, maybe a combination of materials for the platform would be beneficial. A thin piece of slate is pretty heavy and might work better in conjunction with wood. I'm not sure it's a good idea to decouple the table with those things under your cones, except for motor considerations. Was that worked out by the guy from Trans-fi?