Thanks to the suggestions I received on the Pen&Paper RPG bloggers community

Thanks to the suggestions I received on the Pen&Paper RPG bloggers community
https://plus.google.com/112321100855601084365/posts/f7JkNa4mrbX
I have downloaded Lady Blackbird by John Harper.
http://www.onesevendesign.com/ladyblackbird/

I have used a photograph of the American BB-35 Texas battleship to create my own version of the imperial Hand of Sorrow starship. I printed the photograph 
https://www.withfriendship.com/images/h/39732/uss-texas-bb35-page-1.jpg
and I did all the rest with paper, scissors, colors and brushes. It takes a lot more time than Gimp, but it's fun :)
The cool thing about BB-35 is that you get very detailed maps of the whole battleship / starship!
http://www.bb35library.usstexasbb35.com/imagess/deckplans/1944plans/full-size/1944large.html

Of course, nothing of this is necessary to play Lady Blackbird, which looks very cool and simple.