I made some countertops last year from scratch. The longest is 18 feet long. Made the legs of steel, the rest from wood and then laminated the tops. Everything can be broken down into no longer than 8 foot sections for the next move.
The legs are 11 guage 1-1/2 square and the crossmembers are 14 guage 1" square. Scraps were cut to fit into the bottoms of the legs which were drilled and then had 5/16-18 nuts welded on. Those were then welded into the legs. The tops of the legs had 1/8" plates 3" square welded on with holes for attachment to the wooden frame. There's extra holes due to bad planning.
Note there is no pic of the threaded parts for the feet fully welded to the legs- they're just tacked on in the photo.
Everything started at 23 or 24 foot tubing from the steel yard.
FWIW, the Evolution saw is pretty decent.