I've uploaded MacMAME 0.102u5 to MacMAME.org.
Although the distribution is still built with CodeWarrior, I've made several changes to the Xcode project to try and make it easier to just click and build. Let me know if it still requires some hand-holding.
There's a "Build Notes.txt" in the source archive that details my build environment. Note that the Xcode build now requires Xcode 2.2.