You might check with JC over at www.ubbdesign.com - he's ported ubb.classic and ubb.threads to use nuke as a front end. We're using something written specifically for ubb.threads at www.ubbdev.com that is real nice and easy to setup as well. There's content islands available to do 90% of what portals do in the base code for ubb.classic
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.