Hey Chronus,
I've seen BM's with both white and black datewheels. The one in my hublot catalogue is flat (non-cf) dial, white datewheel, and brushed ceramic - which seems to be the most common configuration:
But variations exist - my AD has a polished bezel, for example. Not sure about the cf dial though!
Regarding the back of the case: yes, it's supposed to be black surrounding the glass, but really, it doesn't matter - if someone knows the original that well, the biggest tell by faaar will still be the movement, so you're still screwed if he or she looks at the back of the watch...
Cheers!
Pedro