Might be interesting. I converted the 2E module Maze of Madness (for 15th+ levels) to 3.5; I just haven't figured out how to upload it to the downloads page for general use. I've read H4, though... it would be a blast to play in 3.5. Question, though: which version of the demon lords do you intend to use? The ones in the BoVD were sadly underpowered,
IMO - if you're going to make this a challenge for 100th level PCs, I'd suggest using the ones at Dicefreaks (though I'm not sure if they've done demon lords or not).
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