I cut the fender off, bought some throw away foil trays at the dollar store, cut one up and rubbed it out against the fender and hood until it looked right. I left the shape big enough to fold the edges over the fender and hood edges for some strength.
It really didn't take long at all.
I think I'll do the same for the rad support, maybe even the bumper.
There's nothing on the backside of the new/wrecked panels to give anything strength - I was thinking of mixing some epoxy glue and coating the backsides... ?