Last Month the Japanese try to retrive this mod a little bit more. They played in the at 2pm CET. At the moment the gametracker,com Server Monitorring is off. Hope soon they turn it on. The ranking seems to work.
The buildings and vehicles are part of the mod, so the only space taken up is the entries of where they are to be location, spawn time, strength etc.
If the textures are done in Battlecraft, then the textures are tiles of the same texture, and so compress into small files.
If however the map textures are done in ED42, then its like a large picture, it makes the map look more releastic because there is no 'tile' effect, and lots of detail can be put in. The down size is that the information is unique and does not compress well.