I then cut vertically down the flange on the bend line to meet the 1/4” hole that was drilled. After that vertical cut was made, I used a hand seamer to bend the tab out to almost horizontal. In order to completely flatten the “tab”, I used a 3x rivet gun with a mushroom flat set installed and a back plate used for back riveting, lots of tape and an air pressure of about 50 psi to finish pounding out the “tab”. This worked quite well. After the tabs were completely flattened horizontal, I cut them off with the band saw and sanded it even. I then softened all the edges with various files and a scotch bright wheel and a pad. After I completed the 6 degree bend up. It worked out quite well and it. Should be pretty nice once I attach everything. ** notice I did not trim the flange back at an angle per the plans right now because I have no reference as to where the skin hole will be match drilled, it will be trimmed once I know where that hole location is so I can maintain proper edge distance. Hopefully this helps someone...