So far I am thining about 6"x6.7# channel for the vertical, top and floor beams. I have some 2x2x3/16" angle for the legs. Planning on 1/2" plate for the pressure plate and bracing in key areas. I was thinking 3/4" cold rolled steel for the adjustable pins. But I wanted to go with a 1" cold rolled driver off the jack. I just wanted a little more steel around the adjustment holes on the vertical beams.
I am planning on using a HF 20t A/O bottle jack. I can run 150psi into the jack and a second regulator for the plasma and other tools that won't run at such a high pressure. Planning to MIG everything together but I have a boatload of 1/8" and 5/32" 7018 sitting next to the rod oven.
So what say you? I looked at the crappy HF presses today and realized that the incremental cost to have a quality press with an air actuated jack is not very large.