Do the shade sheds and other such structures have a wind rating, also you'll probably find that as you won't be allowed to enclose your carport all the dirt and rain will blow in. I put the heaviest duty shade cloth along the side of mine and both dirt and rain still gets in with monotonous regularity, I will replace it with the plastic backed cloth but how long will it last. A cheaper alternative is a good boat over although I've seen a few that would approach the cost of a shade shed and it doesn't have the convenience factor.