Tile based, turn based, 3d gaming has been done before… but not exactly well.
(D&D: Eye of the Beholder… circa 1991)

…That said, in an open source game, if there is enough interest, and also the expertise (and possibly some overlap between the two is required) then anything can happen![/quote]
Implying that that game wasn’t AMAZING!
As for ADOM, that uses Noteye if I remember right and Cataclysm displays things differently so it wouldn’t work with that, otherwise we would be able to have first person Cataclysm now.
If we did have first person Cataclysm, that’d be pretty neat but I probably wouldn’t use it.