I've been leasing a car condo for the last three years, have some acquaintances that own them, and have personally looked into buying one, so I can answer some of your questions.
Yes, the loans can be totally different, i.e. shorter terms. bigger down payments, possibly higher interest rates, etc. And some banks will not finance you at all. Insurance in some complexes is required, some insurance companies will include it under your existing homeowners policy, others will require a standalone policy.
Most just assume you're going to be working on your vehicles, I know one family uses theirs to build and repair their cart racers. At the moment, the complex I'm in only specifies that car painting is not allowed, welding and cutting is OK.
What are you looking for? Are you just looking for a space to work in, or do you want to connect with others who are like-minded?
We have quite a few condo developments in my area, and it seems like all have different personalities/client types and resale possibilities, or lack thereof.
One is the place to be for car enthusiasts, it's been around since 2013 or so, and they're now building the final unit that they have space for. Both new and resale units are reasonably priced, and they have appreciated in value over the years. Folks both socialize and work on vehicles there. I know people with units there, and until it was sold recently, I had a connection with the owner.
One was supposed to be exclusively for high-end enthusiasts, with multiple buildings and a race track. It stalled, they only built two buildings, and the race track project is dead. I know three people who have had to sell their units for a fire-sale price.
The point I'm trying to make is, some complexes will thrive, others will wither. Unless you're buying into a complex with a good resale history, approach with caution.
If you're going to move in a couple of years, I would just lease the working space until you move and build your dream garage. My leased condo is only a 5 minute drive from my house, but I'm still thinking about building out my dream garage.
Just for info purposes, this is a website run by a local real estate agent, he sells units for several of the complexes:
KC Condos
If you have any other questions, feel free to reply here or DM me.