Yeah, wow, ouch!
Lovin it! I will definitely be getting stuff from this adventure into mine.
But yes, it's sooo brutal as written, and my players are quite fond of their characters, and they have been know to walk head first into every single trap I put in their path ... which means guaranteed failure if I were to run it as is ... but a mine of ideas!
I would love to run this as a one shot with characters players werent attached to and just let the dice fall where they may though! I'm sure it would be awesome!!!
edit: besides my players would probably spend 2 and a half hours talking about what to do in the first room, hehehehe!