I'm looking for the same type of info. It's hard to find. I think the pros keep this stuff to themselves. Here is one link that takes you through the whole process. It's not exactly what you're looking for, but it's still helpful. This guy uses a metal custom pan. I have read that some guys won't rework the plastic OEM pans because the don't provide enough support, and then there are other guys who only rework the OEM pans. Depends on what you're into, I guess. Anyway, try different search combos on Google and YouTube.
http://www.youtube.com/watch?list=PL667694AC4A48FA44&v=hXd-jbeZBSc