Thank you very much for your feedback. I am super happy that you played that long :)
I think it's a great idea ( the quality / grade ) I'll definitely go that way to make it more interesting. I guess I should maybe also able to disassembling sets so that you can change parts with better ones along the way.
It's a great way to do more with less ( visuals ) so I really like that idea.
Thank you very much for your help !