Since today for kfreebsd-amd64, and probably tomorrow for kfreebsd-i386 too, the gnome metapackage is installable on Debian GNU/kFreeBSD. More here
Do you feel like helping? Install Debian GNU/kFreeBSD on your favorite virtual machine, upgrade it to the latest sid version, and apt-get install gnome. For everything that’s not as enjoyable as it should be, report bugs.