re: Compatibility for exploration
On the moon's surface, the moonbase modules do not have to be compatable and linked-up.
I don't understand why. Look:
It seems to me that if a Moonbase is required, astronauts should not have to every time don a spacesuit to go to another module!
Besides, it looks like the focus is on EXPLORATION, (meaning spacesuits and moonbus and later marsbus; those busses can serve as a base too; they don't have to move all the time)
Raoul