Mercurius
Legend
I converted the module to 4th Edition for AnonyCon this past weekend. You can see the basics of my conversion at the link below. It's not much, but it might save you some time. Also note that I use an exploration-focused style of play, which you can read more about on the blog, so the encounter builds don't match the standard 4th Edition guidelines. It's definitely one of my favorite modules of all time!
Legends & Labyrinths
Thanks, that is helpful. I'll probably up the levels of the monsters as the PCs will be 11-12th level, but it gives me a good sense of direction.