Caveman,
Somewhere in your post it mentions that there has never been a similar case. There has actually, strangely enough to a JAL 747, where the vertical stab was lost following a depressurisation through the rear pressure dome into the fin structure.
Those gallant guys managed to keep the ship airborne for over 40 minutes before coming to the same conclusion that they had no chance. There was one survivor, who still appears on TV from time to time.