UPDATE: My younger friend did indeed shore up my shelter door against drafts on Sunday!!!!

We only needed the 1/2 plywood (4' x 8') piece. We also cut up some 1/4 inch particle board in two 5 inch strips to use on the 2 sides to cover where we stuffed in recycled fiberglass insulation.
I put the horses in Sunday night and kept them in all of Monday. 25-35mph winds with 50 mph gusts.
Still in the works to get my other friend to finish clearing the shelter.
ANYway, for the first project he asked for $40.
I wrote him a check for $50