AND I've cut my first keg! Built the 'Bobby Jig', took my time, and voila top is cut off! Did make one mistake, and that was cutting thru all one side before the other side was ready to go, and the top fell from that side with about 6" of steel needing to be cut 180 deg opposite. Propped up the lid with a piece of wood going underneath the lid and over the cut lip and finished my cut, but it wasn't as clean as the opposite side. A bit of grinding cleaned it up acceptable to my tastes, and no sharp edges...
Damn! Sparks, noise and power tools always make you feel like a man.