I kicked around the idea of a semi trailer with a fix it shop-mill, welder, lathe etc inside. And some sort of housing unit.
Problem I see is every place you could pull in and set up., there would be a local guy losing work.
My wife and I are tool junkies. Different sorts of tools,she is oriented to soft goods, spinning, weaving, sewing, knitting, I am the wood and metal guy. We just love to make stuff.