I have 6 cars right now. I just built a new shop last year. Mine is 60 x 72 with 2 18 foot overhead doors on it and a man door across the 60 foot side. That left me plenty of room for workbenchs and cabinets. I have an area with a 4 post lift. I did a full bath with walk in shower, compressor/utility room and a storage room thats 12 x 30. I did 12 foot ceilings which works great for the lift.
You have the room, go for it!!