Zebrafive
Super Member
Since it appears that both ends of the build will have a driveway to it, I think it is a good idea to have a man door on each end. 4' wide ones might let you use that door for more and not have to open the big doors and let the heat out. What will you use for heat? Some people in the frozen north do in slab heating for their shops. I've been in houses with floor heat and it's really nice.
Would you be putting a car lift in at some point? You will need extra width in one stall for it.
Lay out the bench and workshop equipment to see if there's enough room for everything. You can put tables saws and other equipment on casters but you'll still need storage room and floor space to move it to when you use it.
Another thing a car lift requires is footing where the lift will sit. Easier to do now than later.