Hi vimes,
I can't pretend to be a CEGUI expert, but I have been using it for a bit (including doing my own looknfeel) so perhaps I can help?
Can you tell me which version of CEGUI you're using? I assume you've created your own looknfeel and imageset - are you able to put these up somewhere and I'll have a look.
I have to admit that I'm interested by the content of your screenshot. A few months ago I thought about how I'd go about modeling a globe such as yours for a turn based strategy game but I decided I had enough to do
Cheers.