My theary on how to get the space mountain room is that if you look at the tomorowland arcade there's a space mountain game my guess is that youcan win the room by beating that game. After all yavn said "the space mountain room will be availabl not by quest but in a special way."
:CastMem:

this has already been confermed (sp)

oh really this is embarissing sorry guess i didn't search good enough i apologize.
:CastMem:

oh its nothing to be sorry for you did not know.