Those are good points. I've read in a The Space Review article that one launch of the Saturn V cost about $2.4 billion in the 2004 dollars! Can you imagin today's NASA bearing these costs? Add the costs of restoring the tooling, the engineering knowledge, adjusting to the modern technological processes, etc... and also the Engines! The F-1, (man those were Great engines!, simple (/edit relatively low chamber pressure=simple turbopump, the whole thing just a bucket with some plumbing piping really), reliable (2,000 secs of firings / 20 restarts on the test stand!**), relatively inexpensive, high thrust, moderate ISP, kerosene, perfect for the first stage...), and also the J-2... Unfortunatly making high thrust liquid engines seems all but a lost art nowdays. Anyway I agree not much would fit todays budgets and demands of finer architecture. The CM, many LM sub-systems, basic capsule shapes, the moon rover, etc... could be very useful though. <br /><br />[edit] ** this test was done on one qualification F-1 production copy as I recall