Made one F-623A forward attach strap per the plans dimensions. Cut on the band saw, edge finish with files and scotchbrite. Test fit and marked rivet holes. All have allowable edge distance. Made second forward strap the same way.
Layed out and cut the aft attach strap per the plans. The small part that sticks out must be perfectly centered to have adequate edge distance. It fits in a corner with a rib on one side and edge of skin on the other, so I don't see any way to make it bigger. Will have to be careful when drilling this to the structure.