I know that the 10 x 10 doors are just big enough, going larger would just be too much out of the pockets. As for the metal roof, let's just say I know a guy. I've been told that I can get the sheeting cut to length for under $3.00 a linear ft.
I had an interesting discussion with a friend who is a Mortgage lender, he thinks that now with the interest rates going up again that the price of materials will come down drastically. I suppose we'll need to wait and see as I will still need to sheet the sides.