Dutch Door End Wall

My doors have broken twice, both in unique ways! these doors CANNOT withstand high wind, or medium-strength impacts. The welding is shoddy, and the delivery for the parts often does not include all REQUIRED parts! most recently i purchased two of this kit. The kits I received did not include the several hundred screws required for assembly. I had to jerry rig my new doors with parts i had laying around and new resized screws i bought from the hardware store nearby.
I have had to re-weld parts of the doors more than once, due to the fisheye end caps on ALL the aluminum welds, and replacing parts is expensive. The doors are a great choice for gentle farmers, with zero wind acting on their tunnels at any given time of year. Otherwise, i'd recommend a different product.

The Tek screws on the latch bar don't hold up to wind. Both sides of our previous tunnel have stripped loose. This could be solved by using nuts and bolts instead.
It might also be beneficial to add flashing bars around perimeter of door to cover the gap. (Similar to the bar on inside between top and bottom doors.