You are dreaming. The total package of space hardware includes electronics, software, exotic materials, mechanics, and thermaldynamics. Deep mathematics in each of these. The firms that normally handle such projects are all ready staffed with multiple talent in those areas and others I have not listed.
I know engineers in the other disciplines who are out of work. They already have the skills in which you imagine yourself to be a pioneer. The only way you can compete for your dream is to go to school and earn a few Phds and then work for $8000 per year. Perhaps you can take your dream to India and hire engineers for your company.
Under the present circumstances, you have nothing to offer above and beyond what American companies have already dropped into unemployment lines. You are kidding yourself if you think you can compete with the companies that are established in the areospace industry. They will be doing the engineering and production in India.
I know several folks who have attempted to start high tech companies. I have done the same. They all fail for the same reason these days: No funding. American technology is dying. Unless you and everyone else in this Nation successfully pressures Congress and the President to take some action to "level the playing field", nobody's dream will be realized. I can build robots from scratch. I own the metalworking machinery and CAD/CAM software for mechanics and electronics. I do produce the electronics for which I write the software, and I can certainly make the mechanical stuff. That and $0.75 will get me a cup of coffee. I already do what you hope to do. My hopes are all but destroyed by fellow Americans who don't give a good god-damn about American engineers. Do you really want to join the "New Society of the Outcast", the American Engineer?
Plumbing, hamburger turning, carpentry, and installing kitchen cabinets are the class of jobs that will be resistant to outsourcing. Of course, those jobs are reserved for Mexicans.