Hey Sandman, its really looking nice. One suggestion though, I think you might want to increase the width of the Secondary hull. It looks pretty accurate, but the SEC hull looks a tad thin. Also, you might want to check the size of the Warp Engines, they might need a slight decrease in size. Other then that, it looks perfect.
Also, when you get this puppy done, do you mind if I make a few kitbashes with it? I've always liked the simple design pattern or the Ambassador class.