Thanks for your comments, that much more encouraged to work to improve this great simulator ...
I show some screenshots of U-Boat type-VIIB, and finish the tower and I'm putting the emblems that correspond to this model submarine.
The deck and the substructure to be ready later this week:
I am working with the different paintings and Scheme who used these subs, I hope to finish it soon ...
Greetings and thanks again ...