I have just recently switched from hosting D&D 4E games to hosting Warhammer games. I really prefer the core mechanics of Warhammer to D&D. I still like some of the campaign setttings (and detail maps that go with them) for D&D, and am thinking about using the Forgotten Realms campaign setting with the Warhammer core mechanics for some of the adventures that I am planning to write. Has anyone else tried this/what did you do/how did it work out?