In the fallout wiki it is mentioned that the Enclave also used T-51b Power Armors to supplier there Troops.
It would be awesome if someone could make a texture for that.
Than I would make a mod to give enclave soldiers that armor alongside APA MK I + MK II
http://fallout.wikia.com/wiki/T-51b_power_armor
Now, only the most technologically advanced factions with ties to the pre-Great War American military or federal government, such as the Brotherhood of Steelor the Enclave, have access to this type of power armor.