Guy and this thread inspired me to make one of my own, and I shamelessly took his ideas:
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The sides are 2-bys, with grooves routed in the sides for Incra tracks, and the tracks mounted on the top perimeter to hold the top in place. The top is a 1080 replacement, which is cheaper than an MFT/3 and about the same size. The legs are 2-bys, ripped and glued up in an L-section to maximize the corner space underneath. I fastened the legs to the sides with flat-head 5/16" machine screws in tee nuts. I tapered the legs and chamfered the edges. The levelers are 5/16" carriage bolts in tee nuts, which I find are easy to adjust with a small wrench. The frame seems to be plenty stiff and stable. No braces under the top, yet.
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I have the table next to my table saw for use as an outfeed support. I decided not to groove it for the miter gage in order to preserve its strength. I don't expect to use a cross-cut track, so I didn't provide for it.
Mistakes I confess: (1) I didn't wait to have the top in hand before I made the table--I was too eager to get it done. I found out that the 1080 isn't exactly 28" x 43" or whatever the literature says. As a result, I had to trim a bit in order to make it fit. Good news: clamps in the holes near the edge still have plenty of range of motion. (2) I didn't allow enough space for the countersunk screw heads. They come too close to the side tracks. (3) I didn't allow enough space for the tee nuts on the inside of the legs. They fit, but just barely.
Quas dogs are on the way from Bob Marino. Can't wait!
What a difference between this and the holey homemade rig I've been using. Thanks, Guy!
Crox