By any chance, does that thing have English BB threading?

Those head lugs remind me of this (though they are obviously quite different at close inspection):



The only other frames in addition to yours (and that faux Rossin above) that I've seen with those cutouts were in this thread - a Danish Schroeder, and that black Moon frame that Unworthy1 posted:

http://www.bikeforums.net/showthread.php?t=545394

I forgot who brought it up, but one fellow did point out the pitfall of trying to ID via a circular hole drilled in a lug: It's the easiest lug modification any two-bit framebuilder can do - stick a lug under a drill press and go to town.

-Kurt