The seat lug begins with some 1/8" holes to perforate the area to be removed.
Moving around the lug, more large chunks of metal to remove. You'll see on some of the lugs, I started with a design roughly drawn on the lugs, but I deviated on some of them. Chalk it up to inspiration.
The beginnings of a design.
Removed a chunk and thinned down the center. I have to give credit to J.P. Weigle for the large loops on the back of this lug and the underside spoon of the other lugs. I saw his design on Kirk Pacenti's site and always liked it.
Moving on to the sides, cleaning out the large loopy openings with the die grinder.
The finished lug. Admittedly I missed a couple steps, but you get the idea.