If you work on your own cars/truck make sure you have strong enough concrete poured to support a hoist.
Assuming you have a spot where you can raise a car up. Little late to plan the overhead clearance.
.Edit to add: you didn't build it big enough!
You will regret it in the future, ask me how I know!
Haha, I don't even change my own oil! [emoji23]
And I think everyone that's ever built one thinks it should have been bigger. That's why you see properties around any rural areas with 3-5 barns! I have backup space in my warehouse that I can keep the boat (in the winter) or utility trailer so not a huge deal.