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I would imagine that the descent would be more of the problem for this. I think that apollo astronauts experienced about 4-5g when reentering and shuttle astronauts experience 2-4g on reentry. Also an interesting point (but best to ignore it) would be that without an atmosphere to play with, the Lunatics may not have reseached thermodynamics as much as we had and may not know of the bernouille principle and aerodynamic lift from winged craft.Just a question... assuming those lunar people can survive 1G, then what is their maximum? If it's 1.5G, then your launch vehicle has to be very inefficient.
IMO by far the hardest part would be to drop an Atlas-sized launch vehicle down from orbit in a ready-to-launch or ready-to-assemble-to-launch state without damaging it. It'd need to land point-up or have a construction facility to get it ready to launch. Descent-to-and-launch-from-Earth requires the vast majority of Delta-V of the entire trip.