Editor placeable Range and range objects

Our dev team is attempting to make an 8 target placeable range and various range essentials, how ever we are not sure if the traditional methods of modelling the terrain portion of it(the Bunker and firing lines), can be done with out issues in game, we have been looking at the games various objects that would fullfill the games requirements but are unsure of the meanings of some of the file elements and their relationships to the model or basically are they even important..For Ex... in the runway_main_40.p3d it has 3 LODs [1.000][Geo]&[Memory],,the 1.000 lod has one named sel [--main 40], the[Geo] has nothing as far as i can see, however there are 2 entries in the prop name dialog box, Class and Map.. It seems the magic layer is the [Memory lod], it has " .sp_dty_A_0 with various other stuff in there...all seem to reference the same verts/points... so do we need to follow the same naming convention here or can we name things as we like, or does anyone have a good understanding of this?.