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Okay, now, so I have a couple of questions regarding the construction of long-term fortresses like the Monestaries of the Astartes. My first question is: would it be more effective to make walls of some kind of blank-crete or some kind of metal? Also, what sort of flooring would be best for a 40k fortress, wood or stone?

Probably Ferrocrete. It seems to be a durable material since it comes in item descriptions as being something they can punch through.

Go with whatever you think is more thematic for the setting. I guess logically they would want to use some future alloy of some kind, but who wouldn't want to have an actual stone castle as their fortress.