Hey guys,
I did the outer wheel house mod before I cut the quarters off, back when I wasn't planning on taking the car project as far as I am now.
The car was on the rotisserie, and I just cut a hemispherical section out, leaving an edge to weld to all the way around.
I made cardboard templates for the two pieces on each side that replaced the old stamped section, then replicated them in sheet metal.
I tacked the two bits together and to the car, then cut the tack welds that attached the joined pieces to the wheelhouse.
Welded the two bits together fully, cleaned up the weld, then welded them into the car.
My car used to rub the rear tires in that spot, and there is plenty of room now.
Cheers!