#56 is very cool. It looks like a jet afterburner. Can you add the jet? Here is a pic that might help.
http://1.bp.blogspot.com/-xwWnpMDEzy0/Uibt7UPIE4I/AAAAAAAAGLo/gBTfWIKWAe4/s1600/f-16afterburner.pngAlso, I really like the lettering on #9 and perhaps make the JET a little smaller.
Great concept.