Job well done Roger! It looks a little unbalanced to me on the whole but at the same time still looks really great.. dunno how those two conditions exist at the same time.. I'm probably just going crazy. I'm very surprised that the curved walls turned out so well: definitely a testament to your skill man.
The angle is done by making a long series of staggered 1 X 2 bricks. (Look at the picture of the ship to see exactly what I mean.)
There's some gap between each brick that produces a curve when you bend it.