As Tiny said, fiberglass does not make a good nor permanent repair on steel. The differing expansion rates will soon overcome any adhesion the resin may have, where you end up with a sheet of f/g flapping in the breeze. If you have troubles finding someone to bend up the pieces for you, those straight bends should be fairly easy...even as a mail order, send someone a small sample cut out of your roof so they can get the bend distances correct. I have done this before for some
roof repair sections for a guy in TX.
Your picture wasn't too clear, but it did look like the corners were not damaged. Keep your fingers crossed. On welding in repair patches in the roof, the other consideration is to look from the inside for access for hammer and dolly work. In other words, the horizontal seam should be located where it's accessible from the back side, if possible. Any welding causes shrinking in the metal adjacent to the weld. Access from the back side (inside in this case) helps tremendously to be able to planish the weld to stretch the metal to counter the shrinking effect. I'm not familiar with the 41 to speak knowledgably about whether this access exists or if the roof is double wall, so consider those "generic" pointers.
