I needed a workbench for working on stained glass (so no heavy pushing like with hand planing). I took a spare sheet of 3/4" particleboard with melamine finish on the faces and cut it to 6x3', rounded the corners with a jigsaw and attached 4 IKEA screw on legs that I had from an old table. The legs are very strong but the table seems to be a bit too long for the material and if I press in the middle it bends considerably and springs back to place with a wobble when Iet go. This wouldn't be a problem except that for stained glass I need to do very precise movements and I can't have the thing wobbling on me every time I make a cut.
I thought about installing edging with some scrap pine that I have except that I rounded over the edges and it's going to look ridiculous.
I also thought about adding another set of IKEA legs in the middle but they don't make them anymore.
The last thing I thought about is screwing two strips of pine running parallel to each other, fastened to the underside of the table so that you wouldn't see them but I'm not sure if that would work (though it's the same effect as siding, right?)