I hand-waved a huge chunk of it, yeah. By the time my players got there, they were all about level 8 and nothing was really a challenge, so they mostly explored it and got a lot of flavor text and not much else. Plus there is oddly about 4 or 5 different ways for them to figure out about getting the dragon bones and foolishly I didn't cut any of them so by the 3rd or 4th time I was just summarizing things - I would definitely cut all the extra clues once the players figure it out and have acknowledged the quest.I was wondering how others have played this, did you add anything extra? did you hand wave the empty rooms?
If your players are lower level you could use it as a pretty decent mini-dungeon but it really depends on how much your group enjoys dungeons, especially given the castle is just one famously huge dungeon.