Sounds good bob. I think it will be stronger than regular c-channel because the "ears" will have more material to them. The angle will have the thick corners to make it stronger there, just like the channel would. 10# 6" channel is only 2" wide on the ears and when you take into account the web thickness you are putting a 1" hole into something that only has a drillable width of aproximately 1.7". .7/2 = .35" on each side of the hole. Then add a downward force of 20 tons and add a whole bunch of holes. Seems like you are asking .35" of steel to do a lot of work. At least once you get down a few table levels and your stretching the very thin material that is around each adjustment hole above the table.

It would be neat to learn how to load calc this type of thing.