Great custom! Very different from what we're accustomed to seeing, which is human heads under the helmets. What bugs me about having some species being adopted into mandalorian culture is just that, though, how do their heads fit into that iconic helmet? Then again, it WOULD be true what they say: It's not the suit that makes the mando, it's the mando that makes the mando. Honestly I think it looks great on its own. Maybe paint his hands over to make it looks as if he's wearing gloves, but I don't see a need for any headgear.