I have cut out the tower and bonded it to the main hull, which is now complete. I didn't sand down the final layer of primer and sprayed the balck down in short dusting type bursts out of a spray can. I'm pretty happy with the result which is a textured almost speckelled' finish, which I think is more indicative of the real ones after a couple of patrols under the ice caps. Next up is to fit out the windows and lighting. For this one I am going with filament bulbs rather than LED's (colour is less intense and looks a little more authentic) and then laying down the water line and other makings; and finally some weathering incuding rusting all those limber grates.