My god... I just read that thread, and I was laughing until I realized they were being serious. You can't use third party bits in a CONVERSION!?
You can't use a different model from the GW range if there's a mini available (The ex he gave was painting normal Boyz and using them as Commandoz or something, which they specifically ban)?
My god. I'd never play there. You can't even use third party minis when GW doesn't make one, and you HAVE to use GW stuff ("Regardless of your personal feelings of aesthetics")...
I'm so glad I live near a store that allows just about anything, as long as it's painted.