How about a workshop space where you provide the tools and floorspace for people to work on projects - woodworking, welding, etc.? I cruised the internet and found a few existing. I see lots of niches and directions you could go with it.
-Take home tool rental
-Teach classes (free ala Home Depot, or fee based for more in-depth topics)
-Build-a-bear style projects for kids --> teach kids how to be useful and independent (my own 11 year old can change his own bike tube, fix his chain. Most can`t.)
-Membership for open access, higher fee for one-time shop use
-Rent to businesses - i.e. independent service people who do not have their own shop & only need to occasionally fabricate stuff.
-focus on woodworking or metal, probably keep it narrowly-focused at first.
-Expensive to stock with tools and rent a large enough space.
-May have to pay others b/c I don`t have much hands-on skill myself. My husband and dad do. . .
-high cost to maintain tools when novices break stuff