I'm sorry asw but I didn't had time to play when your Rhine map was on CT.
But I downloaded it and checked it offline. Shortly:
GREAT WORK!:)
I like those forestes little snow here and there, very natural looking! I copy your idea to my winter version of FinRus (maybe I put a little bit more snow). Idea is good: forestes are green and the ground has snow cover.
Actually I had worked in 1984 three summer months near Stuttgard and I must say your rolling hills are straigt from there. Have you summer version, too? If you don't have, do it!
Ps. Where are my pines? I want absolytely my pines to this map!!!:D