[Btw]

Remember you can approach the insulation issue on both sides of the door. I usually hang thick plastic on the outside of the doors as well.

A board screwed above and on both sides, plastic stapled, then another board over the top and screwed in as well works for blocking direct wind. If you leave one side hanging you can still use the door if needed. It looks like you are preparing for a biohazard attack but it works