New build with recycled parts on a ridiculous budget 120cm*60cm work area

[Desertboy]

One clamp is finished but not got enough m4's 20mm to finish the other one, need a trip to toolstation.

You can see how I intend to do it though, hope it works ok ;)

There's a 7mm gap under the clamp at the moment but going to drop 6mm MDF on top of the 18mm so the gap will be 1mm. I'm also considering ways to apply downward pressure in all 4 corners as well for maximum clampage ;)