I built mine out of 2 x 4, coach bolted together, then the top was made of 2 layers of 3/4" decking chipboard, with a layer of 3/4" marine ply on top of that.
I never really thought it out much before I started, or I would have made it bigger inside, for storage. As it was I had barely 14" in between the uprights inside, though I did add a second shelf all the way along.
The sheet wood was bought in 24" widths, so that pretty much dictated the overall size. Next time I plan to go 30" width.
That old bench to the left I built in the Philippines some 15 years ago. It travelled to a couple of different garages with me over there, then we shipped it to the UK with our household stuff, it moved through three houses and four garages in England. It had a new top surface grafted on and ended up as a dedicated 'drill bench' for several years. Now we have moved again it is now it is back in the Philippines currently serving me well as a normal every day multi-purpose over-crowded bench in my latest tiny garage.
If benches could talk, the stories they would tell.....
When my new garage is finished 'old faithful' will be turned back into a drill bench. I shall never get rid of it, as it has seen me through good times and bad, rich and poor.
