If you know an industrial engineer in the field of special machine construction, talk to him. For us, this is part of everyday life. For all these parts, there are simply manufacturers and stores that you should know where such parts are ordered or made.

Not really complex, but you simply have to know these processes and companies.

Take the corporate job, you can still join a startup later, but going back from a startup to a company is more difficult unless you have already worked in a company before.

Personally, I would advise everyone to work in a company first and then go to a startup. For the simple reason that a bad experience in a bad startup can ruin your whole career.

The first rule for founders is not to look for ideas, but for problems that you want to solve.