The top pylon looks fine. As for the impulse control dome, redesign it so that instead of one large control dome, there are two much smaller ones, one on each side of the top pylon.
As for the neck/bottom pylon, it looks a bit awkward as it is now. Doesn't flow properly from the looks of it.
Everything else looks good so far. I'm tempted to try and make my own Akula Class now.