I kinda see it. I don't know if siding him with Death Watch is a way to go. Unless there was something in CW. I don't watch it so, I can't say. But if you're going to do a Mando Kenobi, the armor colors should be subtle, nothing bold. I imagine that if he's infiltrating the Death Watch, he may want armor that blends in to the group. Nothing that stands out. If this is just a concept of "What if Kenobi were Mando", then the sky's the limit. Something I did on my Omega Squad in Mando armor was use Mandalorian sigils (think Mando letters/script in an artistic form, similar to what Muslims use in Islamic calligraphy). Look at pg 10 on my threads. I remember reading in different novels the mention of sigils on armor. Just a couple of thoughts. Good luck.