re: CEV a BIGapollo?
If the astronauts spend more than a week on the Moon, then it's hard imagine one astronaut alone in Moon orbit for that long and what would he do there?
I had hoped for a Moon direct plan, like FLO where everything lands (full choice of landing site and full freedom for Moon liftoff timing).
But anyway, there's a large experience with docking to unmanned space stations (in Russia).