I have quite a few friends doing stuff like this;
Jay&Gary started a business together doing lead work on churches etc, a very skilled hands on job involving bashing lead into shape with a plastic rolling pin type tool.
The business quickly grew and has morphed into a historical building restoration business as they have now included stone masonry.
Two other friends have a large format printing business – hire purchased a few large printers which they now own and just do bigger sized print jobs. Happy and paying the bills.
Another does diesel fuel injection pumps for a living, one man in a shed built up the business but then scaled it down again.
Another has just quit his CEO job of a large plastics company to spend more time restoring Landrovers.
Im stuck un happily working in a mulitnational, HS ruled, skint, engineering job!