And it's entirely possible to do so.
Seriously, if we are discussing a scenario where the Star Forge and the Death Star are existing in the same time period and in the same Galaxy, all Revan needs are either schematics of the Death Star or of something very similar to the Death Star. The Star Forge then starts pumping out individual sections of the station, along with droid ships to assemble those sections into the complete product.
Originally Posted by Ultimate Vader
Slow in what, Dac? It doesn't take a very long time to fire the superlaser, and it's all DS need to win a battle against SF.
Uh, actually it does. The only reason why the Rebels on Yavin IV survived the final battle in A New Hope was BECAUSE the Death Star took forever to get into position and charge up its laser.
And a shield around the Star Forge is perfectly possible. If a little facility on the Endor Forest Moon could project a deflector shield around the Death Star II, the Star Forge could certainly be configured to put up a shield around itself capable of deflecting the Death Star's blast using the power not only of the Lehon sun, but the FORCE ITSELF.
Don't believe me? Let me quote part of your name sake:
Originally Posted by Darth Vader
*evil breathing* The power to destroy a planet is insignificant compared to the power of the Force. *more evil breathing*