I enjoyed the interplay amongst the Nimbus' crew, particularly the biker bar scene. It's obvious that you're putting together not only a diverse crew but one with some edges to it. It only stands to reason that there would be some challenges as differences in cultures / beliefs are pressed together in the confines of a starship.
I really like the idea of a Medusan engineer. I'd give the idea of a Medusan crew member some thought but never follow-through on it. Glad to see you have given Silane a prominent role. Selvin appears to have some issues he needs to work through.