That model is made by good friend of mine- Wink Grise.
Actually his model was inspiration behind my project.
Wink is running his own forum for submarine builders. This forum gathers some of the best builders from around the world, and experts in submarrine subject.
We have few VIIC/41 taking shape there, and some XXI, and XXIII models also, aswell as some beautiful waterline dios.
Let me add, that Wink is working along Dougie Martindale on the new PE designed for Type II U-Boot, and with over 360 parts it sure will be the winner.