I have a thread from the other photo site bookmarked:  The
thread concerns processing Kodachrome at home, and while step by
step instructions don't exist, I've figured that the closer we
get to Jan 1, 2011 the more likely someone will figure out and
post the chemistry and steps necessary for hand development of
Kodachrome, since not all rolls of K-chrome out there are likely
to be sent in before time. Personally, 120 K-chrome sounds
pretty neat, if it were me and I were feeling particularly
ambitious, I'd try to process them by hand after figuring out
the right chemistry and steps.