Actually, the X-01 was created by the U.S. Army, although it was only a prototype that had only a few units that were going to be sent to war (the falling bombs prevented this) The Enclave and The Institute managed to obtain the blueprints for the X-01 Power Armor and create their own versions, The Enclave created the Advanced Power Armor Mk1 and Mk2, later creating the X-02 (Enclave Power Armor and Tesla Armor) and X-03 (Hellfire Power Armor). The Institute completed the creation of the X-01 and improved it.
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Will you do some of this to Spartan Battle Suit, T51c AirForce Power Armor, Enclave X-02 Power Armor and other Power Armor mods? It would be awesome!