Large worlds

I am contemplating a multi player game using TGE. I have loaded a 256 X 256 heightmap for the terrain. The game I'm planning would stretch the length of about 5 or 6 heightmap lengths. (for example, there's a crater in the middle of the map, so you could pass that same crater 5 times in this game).

I plan on having about 3 .dif interiors in each level, and some external walls. along with 5 to six enemies on each heightmap that will be following waypoints.

I also will be having 10 trees per map.

I plan to implement LOD on all models.

My question is: is this too much for a multi player game? I am going to advise players that there should be no more than 6 players per server.

Please advise. I am worried about performance hits due to the game world being this big.
But Torque is so optimized, especially if I use LOD on everything, so I hope I would be ok. Interested to hear your thoughts.


BY THE WAY, I just thought of something: the lightmaps/shadows for buildings placed on the terrain are duplicated to their identical spots in the other heightmaps. so what I am proposing may look strange or not work with lightmaps being generated for competing spots all over the terrain. Unless I decide to put all of my buildings in similar spots. And mission lighting may take forever. I'll have to think about this. Again, feedback is welcome.