I finally decided how to do the exhaust and the rest of the rear of the junka. The main exhaust is made from a Kromlech kannon. Smaller exhausts are extra killer kan exhausts. I added a few fiddly bits here and there as well as the from blade. Its ready for paint.
I'm not sure how to paint it just yet. I'm still thinking about it and trying to decide what would look best and be the most enjoyable.