I'm wondering what the next hurricane will do to a 29 gauge roof?
That gauge is the thinnest that a lot of companys will install. I know next to nothing about metal buildings, but if it were me, I would not want to do it twice. I would be inclined to use at least 26 gauge on the walls and would consider 22 gauge on the roof.
I hear so often "I'm not made money!" or "That's too pricey!". The answer is how pricey to do it after it's damaged and needs to be replaced.
Let's see what other opinions there are out there.