id be glad to lend a hand, i was hoping others would be interested in doing this.
i started with 26 awg occ copper cable. i got my cable from double helix cable. ( http://www.doublehelixcables.com/ )
the only have 24 awg, but he had a small batch of 26 that he used for a different project. the 24 awg isn’t significantly bigger than the 26, but as you know the cavity is very narrow in the headphones.
the cable braid is a standard litz pattern, but what i did to make the cable fit in the earcup was once i had to last few inches unbraided i stripped the 2 grounds and wound them together so i could simply spin the uncovered grounds around the left and right wire, which fit pretty well. heat shrink over the cables and you’re good to go. i know its probably not the best for the ground, because of oxidation and what not, but it works for now. one thing to keep in mind, the left and right cables would ideally be stacked on top of each other to fit best.
as for the 2.5mm, they have a gold right angel 2.5mm stereo jack at radio shack, i simply took the jack out and discarded the plastic casing. i used head shrink to cover the jack as well, which works fine.
overall the project ran pretty smoothly and it sounds fantastic. i personally recommend double helix, the owner is super friendly and has no problem answering technical questions (very quickly)
any other questions feel free to ask!