Thanks!! I'll definitely check out his posts, and perhaps bug him for advice. These are only my first attempt, on rather limited research. On thing I bumped into since then was an oval wooden cup that was reportedly intended to eliminate standing waves. Back in my bio-physics consulting days, we used patterned texture foams for microwave emission attenuation. I could conceivably cut these types of patterns. I'm sure a combination of these could effectively be used in a headphone, but it seems to me that part of the point of using tone woods is to deliberately introduce certain resonances. Also, I wouldn't expect much from an open cup design, as most of the energy behind the drivers would exit the headphone as opposed to being reflected around and back to the ears. By the way, I am accustomed to and can handle a fair amount of madness.
-Brian M. Abel