Yeah, I think someone was pulling your leg... haha
Im sure someone would have found pieces of Doom hidden in the .pk4 files if there were any. Ive looked around and dont recall seeing anything that looked like old Doom resources.
BTW, everyone has thought about it, but is anyone doing it:
A Doom mod for Doom 3. Real doom... with original Doom sounds, enemies (obviously with 3d models.. no sprites) and some levels.
Is anything like this in the works? Id love to see it.