These instructions have been supplanted by an automated, scripted installer, which lives here:
https://github.com/mikepurvis/ros-install-osx
Please try it out, and file bugs as required. Feel free to browse past versions of this gist as a historical curiosity, but I won't be monitoring or supporting it any more.
Yes, I think so. I've updated to use the new ogre-1.9 formula from @wjwwood, so Indigo's rviz now works.