I'm not entirely sure where to post this, as the exterior contains no metal whatsoever. However, quite a lot of the innards will be made out of wood bits, and for lack of a better place to put it...I'll put it here.
Anywho, I'm starting with some Grado SR60s. While not bad headphones for the money, they are made out of rather a lot of nasty plastic. So nasty, in fact, that someone broke the headband assembly, and I was able to pick them up quite cheaply secondhand.
And this is what they'll look like after I rebuild them. All I'm keeping is the earpads and the little speaker-y bits - the rest is being made by hand. (I haven't finished designing the headband assembly yet.) I'll probably do something similar to the original headband, only with a set screw for the height and with a headband made out of creamy-brown leather instead of vinyl.