With a 16' ceiling you have the height to split that height and have the office above in the loft
Push your budget to the MAX for square footage ..AC, heat, compressed air system, and electric can all be easily added later, but it's hard to make the building bigger after the fact.
Try to separate the work area from the storage area so you're not working around finished vehicles.
Put the air compressor outside in a utility closet to keep the noise down.
Does your town/county limit the size you can build? Do you have enough space?
Mike B
