Well done Vladimir!
I have played around with Freestyle for a bit as well but never taken to that level.
Did you only use pictorial reference (trace sketch) or also some sort of parametric datum reference?
Hi Constantin, thanks for your comment.
I have created the main body shape based on imported geometry (I have used the Merge/Inheritance heature) + Freestyle feature.
A the end of this model I have use a few projected curves and Boundary blend feature - try to check/download my model here: https://grabcad.com/library/k-4k-1
Do not forget check my project library and "LIKE"my models , Thanks