Wow, Your model looks great!
Now You just need too "print" it on resin 3D-printing machine and get a beutyfull U-boot.
I would like too ask about few things - I suspect it's a 3D model - is it? What software is Your model made in - AutoCAD, 3D Studio, or something diffrent? What kind of technical drawing reference do You have?
Thank You,
Piotr.