Looks great man
Looking at this I remember that I had something sexy in mind for that thing protruding just below the tailfin... why not keep it the way it is now and do an inset... that way it'll look like the plating - the piece you have now - would gover some maine fuselage or something... The thing back there never got any loving
so it's real rough...
Make it sexy
If you want I'll draw up some concepts for ya!