The small steel table is half .250, half .375, 30" x 60" x 38" high, with angle iron legs and spreaders. Built from scrap about 15 years ago. (Same table from the copper crawler build). Now it holds the bench grinders. There's actually a couple more on there now along with my tube notcher.
The perimeter work benches are 3/4 bc plywood 2x4 frames-24" deep and 39" high, with 14 Guage tops, attached via liquid nail. I don't really fabricate anything on these but weld sometimes. If I ever build more, I would brake the 14 gauge over the front, so I could weld tabs or attachments of sorts.
This one is .250 top, angle iron frame on casters. Triangulated the sub frame area as a "truss" to support the center of the table. 30" x 72" x 38" high. Great, useful table, especially being mobile.
Latest built, 49" x 74" x 39" high. 3/8 low grade (magnetic) stainless, 2x3x 3/16 tube frame. Built the frame, placed the plate on, then set 2- 5000 lb pallets of alternators on it to push the bow out, worked really well. The vise is in a receiver hitch below the table top, so that the top of vice is flush with table top. I build all my tables to have a comfortable vise height with a workpiece in it for grinding/welding, I'm 6'4", my vises are too tall for some of my friends to comfortably work from. All three steel tables house a vise.
If anyone is looking, Morris scrap in Shelby has stacks of plate steel of all sizes and thicknesses. I don't recall the price but I bought this piece from them by the pound, deep discount from metal house price, especially if you can use it without being cut, they will cut if needed. Iirc it was less than $150.
Matt