I believe you have far too broad a task to start out with. You won't be able to gain efficiencies from repeated tasks if you need to be able to repair anything.

I believe you have far too broad a task to start out with. You won't be able to gain efficiencies from repeated tasks if you need to be able to repair anything. I think you will only achieve meaningful price-points (ones consumers will pay instead of purchasing new goods) if you can gain significant efficiency over existing home-shop repair guys.