Happy New Year, slacker_et
It has been quite some time since I've run GSB. If you don't get a reply here you could try to log-in to #gsb on irc.freenode.net.
Gnome slackbuilds isn't directly supported by Slackware, but, it is a very good version of gnome for Slackware in my opinion.
Here's a link from the GSB website that may be of help to you.