nice
I don't have a woodshed, just piles, with just the top covered in heavy black plastic, old broiler house walls plastic.. Some, the bulk of the real winter wood, is between two big trees, three rows deep, and some others are on either side of the well house. I want to add another pile on the back, then a little on the front as well, just leaving the door entrance. both for storing wood and to act as last ditch braces to protect the well, etc from falling trees and branches storms and whatnot. Two tornado hits in less than a year makes ya start thinking in bunker mentality.
If you do a metal roof, by all means use the metal screws with the rubber washers, not the normal roofing nails. Tell ya from experience the screws hold, the nails leave ya a yard fulla scrap metal. Plus, flying metal sheets are not very "friendly" to living things or equipment in the vicinity.
Of course a big enough tornado can suck a semi up, then the asphalt underneath, but short of that, I am also of the opinion that nothing important can be overbuilt too strong. Lots better real stout than flimsy cheap and wuss.
