About all of these add-ons, it comes back to money.
I have a quote on a 30x40x12, with the 2+1 doors. I have maybe $2-$4 extra I can put into it. Thats where its tricky, where to spend it. Insulation in the slab? White Ceiling tin? 30x48 instead of 30x40? Attic trusses instead of regular?
The budget is the budget.