Hello Sven. You've created another superb MOC. My compliments!
If you are considering another project, I wonder if I could suggest that you take a look across the sea to create a classic medium-size American locomotive, like a Northern 4-8-4 or a Mikado 2-8-2 -- especially if it had sophisticated valve gear like you have used on your other projects.
As you must have noticed, there is a real drought of AFOLs who create ultra-realistic steam locomotives -- and are also willing to share their designs with others. For those of us who enjoy the challenge of building, but have no talent for design (like me), you would be doing all of us a great service.
All the best,
Harlan