I am having a garage/apartment (garage 1st floor, apartment second) constructed - foundation and first floor walls already up. My 3410 ROPS is about 8', and having taken such up and down a few times, I decided to design the garage with 9' high by 10' wide doors, and a 10.5' ceiling. I will have 2 bays, 1 for the tractor, and the other for a boat/trailer (8' wide).
It was certainly a luxury to be able to build around stuff I already had (e.g., a tractor - if I didn't have one, I'd have built the standard 7-8' high garage doors, and then cried when I finally got a tractor and tried to drive it into the garage). The apartment on a second floor was an afterthought, prompted by someone on this forum about 6 months ago, who talked about wanting to watch and supervise the construction of their retirement house as it was being built, so they were living in the single large room tractor shed (converted to a temporary house). I want to do the same, skipping the tractor shed for a second floor efficiency over my tractor/boat garage.
Whoever wrote that "living in a tractor shed" post - thanks for the idea, really.