Dave,
I'm finishing up a "Turkey Match" .45 underhammer utilizing a H&A action. I've cleaned it up quite a bit and set it up for a taper-pin takedown. It has an 42-inch 1 1/8th Goodein barrel, fancy American walnut done in a Hilliard pattern with crescent buttplate, some inlays and engraving. I like it and intend to fit a couple more barrels to it as well as have Keith Kilby case-harden it. Underhammers are sort of a an acquired taste, but very practical and useful.
Steve