Thanks
I thought it was a bit odd too, but I've been looking at lots of CGI images and BAE videos and things and I can't see a rudder or anything on there! I thought maybe the propellor pod things were used for steering as well? Really though I have no idea! This is from the BAE promotional video, and I can't see a rudder or anything there:
but then again there's also this blueprint sort of thing at the start of the video that shows one!
I just added one to see if it looks better. I added a bow propeller as well as per above ... the main problem I found is that the design changes a bit on every reference! I suppose that just comes from drawing a ship that hasn't been built yet :/
I think by far the weakest part of my drawings is the hull, I have real trouble with the shading, but hopefully it looks okay