What a great idea!

A do it yourself auto repair shop (complete with lifts, tools, and paint booth) opened near me in Sterling, Virginia several years ago. It lasted almost six months before it closed down. They charged by the hour for access to the lift and it wasn't cheap. A lift had to be reserved in advance, so it was a big issue if a customer didn't vacate the lift when expected.

At one time I looked into the possibility of having a business where cars could be stored and owners could work on their own cars with access to a lift. I went to a suburb of Baltimore to meet with a gentleman who had a similar business to what my plans were, of storing classic cars and providing a place for owners to work on them. He pretty much talked me out of the idea, and a big part of it was the insurance expense. The cost of liability insurance is the main reason many repair shops will not allow customers in their service areas and those customers aren't doing any work on the cars. For the kind of business I had in mind, it wasn't just the high cost of liability if someone were to get injured or someone were to cause property damage, but also the cost of liability insurance for collector cars stored there. The value of the cars inside would change constantly as owners would pick up and drop off their cars. One car alone(a 55 Mercedes Gull Wing I think), at the place in Maryland , was valued more than all the other cars combined. Insurance coverage would have to be updated when ever a car came in or left, so that part of the insurance expense was always changing. He allowed the owners to work on cars there, and ran the business as a club. But in practice, those who could afford to store there cars there, didn't do their own auto repairs anyway, and never hung around the place to take advantage of the club lounge. Still, members would pay for a club membership, and that would allow them to store their car, and to work on their car at the facility.