My small "everyday" table is a piece of surplus AR plate. 1/2" thick and about 30x48 inches. I used some 3x4 inch box iron for legs and some steel casters I scrounged from somewhere. I also weld a piece of angle on all my tables so that the legs are dead flush with the top surface. That makes it great for welding and holding odd pieces, especially round stuff. My second table is an old forklift dock plate made from 3/4 diamond plate and about 5' square. I cut the ramp area off, flipped it to smooth side up and used scrounged 4x4 box iron for legs. This one is stationary, but also has a full width piece of 2" angle welded to it. It also has a 6" vise bolted to it. I also have a shelf underneath for drops. This one has had in excess of 2000 pounds on it. My big table is a simple sheet of 3/8 plate on a framework of 3" channel and 4" box iron legs. This one is on super heavy duty rubber wheeled casters and will roll at the slightest nudge. It has flip down brakes on all 4 wheels. I traded something sometime for this one. I've had it so long I don't remember. Having smooth top plate makes it great to work on most anything. I can weld a fixture to them and grind it off later. I also have a home made weld positioner that has 2 clamps that rotate 360* and also rotates on a plane as well as height adjustment. I welded that to a 6" sq plate and clamp it to a weld table as necessary. I have a total of zero cost out of my pocket. Several hours of welding time invested and years of scrounging. For what I weld and repair a 3/8 top is minimum. I can weld on it and grind it flat and never hurt the surface.
I don't know it all but I'm working on it.
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