The strength is it's virtue -- the power to resist a predator's determination.
We used our inner curves by stomping them flat.
We protected ourselves with leather work gloves.
And we used sturdy framing of at least 2x2 rather than lightweight furring strips that aren't actually rated for structural purposes.
Yes, it's a bit of a bear to work with, but, IMO, worth it.
How did you protect your shoes for the stomping? I sure would have loved to pre-straighten that stuff and considered driving over it but I was worried for the tires.
Once we put our sandwich together with 1x2 on each side it became 2x2.
We were trying to keep it lightweight to avoid straining the hinges over time as we used the doors on a 2nd level brooder. The bottom brooder we used affixed dog panels as doors with 1/4 inch cloth and that turned out better.