I've just been thinking about this game a lot lately. I don't know if I have time to run a WHQ game or not. I remember using a number of house-rules to make the game more D&D-like, but I don't remember where the printed rules ended and mine began.
Is it anything like Warhammer Fantasy RPG? A friend of mine really wanted to play that, but wouldn't run it unless he had a copy of the book physically present (which are hard to get ahold of).
It's like a very crude version of WHFR. Have you ever played Milton Bradley's Hero Quest? It's basically a cross between those two. You even play the same four heroes (barbarian, dwarf, elf, wizard).
The crudest form of the game can actually be played without a GM. You simply draw rooms off a stack as you open doors, encounters and treasure are random, and monsters all appear next to heroes (evenly distributed) and auto-attack until dead. They have a 90-or-so page role playing guide which adds levels to the game, more equipment, a new hero type (troll slayer) and adds rules for a GM.
Basically, it's a pure d6 game. It wreaks of old-generation RPG mechanics, but it's still a really fun beer and pretzels game. The trick is to not take your characters too seriously as a giant rat can just rip your throat out in one hit if it gets lucky!