A roadmap??

I would suggest that the ideal road map should be based upon a document that
O'Neill produced in the late 1980's. The initial step would be the deliverance
of a seed facility to the lunar surface. The facility would consist of a small,
Mars direct type habitat, a chemical processing facility, a mass driver and a
small 'job shop', for producing various items, such as pressure vessels, mass
driver coil rings, e.t.c. The habitat, chemical processing facility and Job
shop, may well be combined into a single large vessel, that would be landed on
the moon. The entire facility might weigh between 50 and 100 tonnes. A similar
facility would be delivered to high Earth orbit, probably L-5.
The initial task for both facilities would be simply to expand themselves.
High-tech tools, computers, people, etc, would be lifted up from Earth. Heavy
items, such as pressure vessels for production of habitable volumes, heavy but
simple machine parts, chemical processing vessels, solar panels, food & water,
e.t.c, would all be produced from lunar materials. O'Neill estimated that the
seed facilities would have doubling times as short as two months.