Changing Character Model

Does anybody know how I could change my character model now? Or is it impossible until the SDK release? I would really like to play as an Ultor Masako or STAG elite (the ones with the Orange and White color scheme). I have found that replacing the Mech with one of the NPC's allows you to play as the NPC but it is really glitchy.
 
If I knew how to change Player, i'll change it to gat!
 
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