Oh, so firearms are not your only vice. I just have 4 or 5 myself. One mounted on the bench, one on a lump of ply with a grinder on the other end that I put on saw stools for some jobs. And a couple of others that get attached when and where needed.
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No75 sounds familiar. Such a useful and solid design. Every now and then I try to find one but haven't so far.
Build the base however you want (timber frame, steel box section, second hand pallet racking beams and posts), then buy a sheet of container decking ply from Plytech. This stuff is HEAVY and hard and will out last you and your progeny in a work bench situation. If you want extra durable, screw a section of 3mm, 6mm, or 10mm MS plate on top (eg 1200x600 section cut off a 1200x2400 sheet). If you are into welding, then I strongly recommend a separate steel frame, steel top table that you can weld bits to to hold things in place while fabricating, and put it on wheels so you can wheel it into the middle of the workshop for larger items or where you need to get around all sides of the job.