3d modelling section needs completion #2

The guide is currently completely lacking in 3d modelling aspects such as importing for different object types (vehicles, weapons, clothes). Raw 3d modelling tutorials aren't really required, however application specific tutorials on exporting would be useful.
Problems like the blender version vs .x format issues should be listed and detailed.

Both build 40 and 41 methods could be outlined, its highly likely build 40 will continue to be in use for some time due to system requirement difference.

Since build 41 is still in beta at this point, any 41 info may end up becoming obsolete so this area could be considered low priority, but would be extremely useful for new modders.