I think it is great
I grow up as a military brat. The on base shop that provide this to the car lovers, new enlisters and senior officers, was an amazing place of equality, bonding and sharing. I know the insurance issue is different as it was Air Force sponsor but yet accidents were very very rare. More importantly the demand was huge. I think you would need to have teachers and managers to avoid the issues but I think the economic could work. This is one of my thougths upon retirement. The capital is significant but I would not over invest in tools few could use.
I would go for it.
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