Can anyone work out why I can no longer build a customized install ISO that spans multiple disks?

Attached is the kickstart file. I last built this on F12, and it hasn't changed except for changing the repos from F12 to F14, and a few minor changes to the packages. It used to build as two DVDs, but now it seems to run out of space when writing to the underlying image. Obviously I'm including more than one DVD's worth of stuff--but I thought the 'part' line was supposed to split over multiple ISOs?

I don't understand why it used to work and doesn't any more... what am I doing wrong?

James

PS You won't be able to build it yourself without removing the 'local' bits, because they're coming from a local repo.