Making L4D Infected Replacements?

I know that one guy who made the teletubby infected replacements did it, but he’s smelly and won’t give me the source files he did to do it. Decompiling the infected is a problem, as it usually skips out on massive parts of the .QC that are require to compile it as a successful replacement. Same goes for the teletubbies. Anybody have any ideas on how to do them? A working .QC maybe?

I would also be interested in this and also for making survivor replacements like S-Low’s Bill replacement (which I might try and decompile to see how it works… if it will).

I’m also interested in this. We should probably look in the L4D SDK character resource files.