I remembered throwing a patch panel in the junk pile because I was not happy with the shape of it. When I cut it to size, there was a bow of about 5/8" compared with the fender. I got out the panel and since I would be cutting several inches off maybe the shape would not be off as much. When cut down if was only about 1/4" of bow so I though I would get it a shot.
First since the bottom part of the fender had already been cut off and used to repair another car, there is nothing to use for a guide. The only solution is to bolt on the fender and align it with the door edge.
I had already checked the cut edge of the fender and determined that it was straight.
It is then possible to obtain a measurement to use with the patch.
Then transfer the tape to the patch and mark.
For the front edge it's a little harder and I won't bore you with all the details, except to say I used a bolt hole for the inner fender mount in order come up with a tape for the front edge showing how much to leave.
Next thing is to check the edges. On the fender it's very straight across where the cut was made.
However the patch is not straight. This can't be simply bent since the crease near by with keep it front bending. The solution is the put the patch in a stretcher and work the metal until the edge is straight.
After a minute or two with the stretcher and a straight edge to constantly check the work, the edge is straight. I later gently hammered the edge against an anvil and now have the edge arrow straight, it should be very easy to but weld to the fender now that it's straight.
Too late to finish tonight. I don't have the energy I once did. Hopefully I will get this fender done in a couple of days.