I don't work a lot with wood. You can't grind it back or weld it up if you fuck it up, and it splits.
So I don't have the kind of clamps carpenters have to span 700mm of wood. What I have, of course, is rated all-thread and angle iron.
I do, however, own a lot of little clamps. Boltholes are now marked and drilled, time to weld it all together!
Stand it up, bolt some wood on it, call it done, I reckon. Take particular notice of the background in this photo, there will be a test later. There are no close-ups of my skanky welding. Suffice it to say nothing caught fire, and it's still all in one piece, even after I sat on it.
There's no kill like overkill. Each plank has 8 x 5/16 coach screws holding it to the frame. That's probably enough, I think.
I wanted to get it done today, and behold, in the light of the dying sun, it is done. Of course, now it's much more obvious that the planks were different thicknesses, so when I put 1/4" Masonite on top, I'll have to shim the front half with a double thickness. Oh well.
Remember that corner of the garage? Not only did it have venomous spiders, it had fungus and half a garden's worth of top soil. Now it has a workbench! Ready to put the shelf in and call it done. It'll get a tool board behind it and in that corner before I'm really done, and a strip light above it, and some masonite. But *basically* done.
Shim!