Took the first step towards building my shop

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Progress on the shop may, or I should say will slow down for a while. Today was the last day I had my helper from out of town also we have exhausted most if not all of the long sheets of sheet metal. And for the second time in a week we have ran out of screws again. When he arrived I had a bag of 750 then bought another 200 then another 500 and we might have had 3 left when we quit at noon today.
I think I'll order another 1000 next week rather than pay the high prices of the hardware stores within 75 miles of me.
Here is what we did this morning

I think you said a 40 foot rollup door was going to be installed in these openings. Or is this one of those aviation hangar style doors that folds in the middle?