It seems so far that the answer to the question of
porting gnome 2 is as simple as using Garnome. I did have to restart the shell
after the bootstrap.sh part so that the newer version of autoconf would be
found, but other than that the install has progressed pretty much without
incident (it did fail in install xml, unable to find some particular hunk, using
paranoid-install). Maybe the simplest thing to do is add Garnome as an optional
package in setup (assuming that the process completes, which is still very much
a question)? This is just an update.