Terrain, Texture and Normal map made in WorldMaschine,
UV-mapped in Wings3d,
Rendered in Mount&Blade Warband engine
It is defintly not practical to do terrain in such a way, but for a test this went quite well.
Texture is 170 kb
terrain mesh is 9800 polys
Atleast doing the terrain manipulation for special props, aswell as the normal maps in WorldMaschine might be beneficial.