Hello.
Thank you for kind words, tips and support. I will give my best to try invest at least 1 hour of interior modelling per day. Also i keep this thread updated with new pictures and progress. The start may be slow because i must learn to use S3D properly. Trying out all the issues with lighting and texturing.
When i get home from work i try our the new S3D editor

Also i am going to look into those light nodes what Mikhayl mentioned about.
@ urfisch
I dont know if this helps but i used this tutorial to get my object imported into game.
http://www.subsim.com/radioroom/showthread.php?t=135177
Also does anyone own good U boat interior reference images? Right now i am collecting all my reference from "Das Boot" movie :rotfl: