There are no plastic ktis out of Serenity. The only known kit is a small resin deal about 3 or 4 inches long, but it's being sold by a known recaster.
While at WonderFest, I saw Joe Brown's foam mockup that he's starting. It was very rough & "geometric" in it's shapes, but like I said, he's just starting it. Hopefully he'll finish it in time for the release of
Serenity.