Re: Thanks for The Corrections
"The "modular" scenario with D4 seems unfeasible to me. Each payload would be of the same modest size as the lander and require much construction on limited life support to make a hab. This falls squarely in the theoretically possible to impossibe realm and far outside a practical approach."
Having an inflatable hab which can room 2 crew and be able to support them for the first day without requiring the crew to do anything and with some maintainance allow crew to live there for a few weeks and keeping total weight of hab below 5 tons, doesn't seem to me to be entering in the realm of impossible.