hmm... maybe it would work the way i do it.
1: get the map editer
2: get the original mount and blade
3: open the map editer (using mount and blade (original) path)
4: edit away
5: copy the map, map icons, and parties text files to new path (mod location etc)
*take these files from mount and blade original folder *i am pretty sure it is these 3 files someone correct me if i am wrong.
at the moment i dont know to much more...
maybe some of this will help. sorry if not.