Fabricators, Machinists, Technicians and even Plumbers. Honestly people give Engineers to much credit. most of the engineering will be done before anything is shipped to space. In the real world it's your boots on the ground (in this case boots in the vacuum) that do 95% of the work and I don't think space will be any exception. With this in mind whole new job descriptions will be created, we will need specialized welders, computer technicians, mechanical technicians, environmental control technicians, and many more. I'm a I.T. specialist but I have done many jobs to get to where I am today. I have been a pilot, a construction worker (paid for pilot training), machinist, hobby engineer, computer programer, audio / video technician, server technician, computer helpdeck tech, electronic technician and telecom tech to name a few. In my years in the workforce I have seen many disciplines of thought, I have had my hands on things that some engineer drew up, but had no practical understanding of what he was engineering. Don't get me wrong. I am an engineer and I have nothing against them, I have to be one to do my job.