To my way of thinking what is required is three stage design, compromising of number of Earth based lift rockets, Moon shuttle that would carry payloads to the Moon orbit and at least two Moon landlers that would remain in Moons orbit. The Moon shuttle would be assembled in the space similar to the Space station. It would be probably most expensive solution but necessary if frequent travel to the Moon is anticipated. May I add that unless there is a burning military, political or economical need – not much is going to happen regarding space travel in foreseeable future.
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