Benson, hi. Did you ever get Subversion 1.7 working well on RHEL or CentOS 4.x? I took a glance back at my old RPM building tools for Subversion 1.6.20 and 1.7.8, and getting 1.7.8 built on RHEL 4 was a pain in the keister. In particular, I wound up having to build and install libserf to avoid dependency issues with out of date neon.
I don't have a professional need for RHEL 4 anymore, but if you need Subverision 1.7 there and want to keep things tested, I'd be happy to help you get RPM building working well for that environment. If you can test it, we can get it into Repoforge "extras" and make your life easier in the future.