Bill - you can appreciate this. I have (bought new) a 98 1200S. We put custom built S&S 84" jugs on it with Wisco forged pistons. S&S "E" carb with third circuit, Vance & Hinds made a sportster version of the Pro Pipe for it, Andrews N-6 cam. Took the big valved heads for a Buell and twin-plugged them (that was perfect as the 1200S was stock with 2 plugs per cylinder). You talk about fast. This thing will keep up with an R-1 to 100mph. You ought to see the look on some of the younger rice riders when an old man on a Harley smokes 'em. Oh yeah, custom paint (iridencent purple flames and a "Harley" breakout paint job on the tank). Most of the rest of the bike has also been customed (handlebars, pegs, lights, seat, etc).
Wife has one too - a Dyna Low Rider, but she has not done a lot of work to it.
BTW - a magizine like Iron Works advertises about a million custom build frames, trannys, engines, etc for a home built custom "Harley". I would think that after the Cobra, a bike build would be rather easy.
Frank.