Is there any place to see or even practice on the lab exam interface?
It is my understanding that the Cisco Lab Builder is the same interface as the CCIE R&S Lab exam as far as how the interaction with routers and switches is concerned. You have to build your own labs, but if done properly does not count against your time for the actual practice hours. The Cisco Flexible Performance Assessments are the TS and Config parts of the lab and supposed to be very close to the real thing as well. This is why Narbik uses them in his classes as does any Cicso authorized CCIE instructor.
the Cisco 365 Session by the CCIE Program Manager (Bruno) and of course the Cisco 360 labs
are close to the real exam...