yep, i love .x map because insted of positioning objects through trial
and error, or getting a map editor, i can just add stuff on to the map. tunnels are easy too, just delete a few tiles and put a thick walled tunnel to hide the edges. the only down side of this is its harder to texture than a height map, but a height map really is the easiest thing you could possibly texture, aside from a wall.
oh, and that last map i think i may have made a bit to high poly, but it cant be more than the poly count height maps give you, man i hate those height maps. any way, ill release a low poly map and mabey a medium poly one. i would do a poly count but my modeler just got deleted and the app i use dose not have a poly counter.