That's the problem - you don't. By definition, the kind of efficient, highly-automated manufacturing you're thinking of doesn't need many unskilled or semi-skilled workers, but it does need skilled and experienced engineers and machinists. It needs a massive and complex ecosystem of suppliers and support.

The depletion of America's industrial base has created a massive skills gap that would take decades to remedy. You can't create a new Silicon Valley with a bunch of bootcamp graduates and some wishful thinking; likewise, you can't create a manufacturing economy through sheer force of will.