I really like your start (exspecially the bridge) so far. But you could somehow improve the overall hull shape. The Ship looks currently like having mostly 45° angles.
The ellipse-function of this tool: http://www.plotz.co.uk/plotz.php might help to build the curvy \"hull-tube\". It works up to 512 diameter circles. And its actually more accurate than paint.
In this case it might be also helpful to load a picture of the ship (for example: into paint and scale the pixel length to the accurate block length. Its important that the proportions of the pixels stay the same.
Then you can just build the overall shape block by block.
Just some tips
Looking forward to the finished model. Keep up the great work.