141 shells and any of those AKG types are a ridiculous pain to open and close, not a typical way. And also the gimbals that hold the drivers in some are a real chore. Search through here for Armaegis' AKG k240 to Sextett transplant in his profile. A real chore.
And not to mention all the openings to try out various things.
Ugh yeah... there's a reason that project has been on the backburner for ages now. AKG shells are non-mod friendly.