Think 'realistic', the Star Forge 'had' enough power, and a connection to the Force to create lot of things..I think if Revan would had the blueprints of the Death Star, also an armada of them
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Be that as it may, a fleet of republic ships more than thousand years older than the Death Star was still able to destroy the Star Forge.
So that's where my vote goes - the Death Star would just blow the Star Forge away, while Vader smugly comments to Malak that he shouldn't be "too proud of this technological terror..."
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You forget that tech didn't change in this 4000 years a lot, actually, I think a Sith fighter could easely beat a TIE-fighter.