Thanks for the suggestions. I changed the roads to a darker version. Doing the same with the railroads i found it difficulter to distinct road and rail, so i left the rails untouched. I also added some railway stations and one or two railway lines too, fixed some broken roads (my failure, i think), scaled down the one texture and changed and fixed here a little bit and there a little bit.
But i decided to leave the map mostly as it is. To change the rural textures is a bit difficult. For the cities i tried some building templates from the westfront map:
City0 template
City1 template
City2 template
The textures are much better and the best result over all as "Monte Cassino" is the City2 template in my opinion. But the maps cities are quite small and there is a problem with the big blocks and buildings and clearing roads and rails. Half the city would disappear ;-). Also it might be possible to build better cities for this map that is to much work for me.
So soon i will link the final version, but as said, there isn't much difference.