Michael,
If I understand you, do you want to re-build the rpm's from source and basically build your own SL distribution from source on your own repository? If so that's something that my organization is wanting to do also and I would be interested in any documentation and how to info.
I turned a friend onto SL and he's asked me the most annoying of questions.....
He wants to download released versions of source codes (SRPMS) and build them for installation.
(Please don't ask why, it's come from someone higher than him on the food chain and so he's at least trying to figure out if it's documented someplace so he doesn't have to reinvent the wheel.)
Thanks!