Yes, my question was quite .......incomplete hihi!
I ask your fsearthtiles setting (*.ini and main fset windows (snap mode, size of base area)), because your belgium2012 scenery is about 3.5 go in 1m/p only and because I tried to make some area of France(about the same total area size and also 1m/p) and my sceneries are so much bigger (10 or more GO !!)
anyway, what are the best setting to have the smallest bgl scenery as possible??