EDIT: I figured it out, that I need to have level 2 of advanced engineering under the laborer class, but the screen below should show that as the required perk, IMHO.
As many posters before me have said, sorry if this has been answered, but why can't I create metal workstations, when I have completed the laborer class, I'm game stage 35. I don't understand since this screenshot shows "Already available to laborer class", and I already have tool crafting 3. How am I reading this wrong?