I think that we have a new field in the free modeling.
Like us , there are a lot of people that likes to make any models, from a simple chair to a aircraft carrier.
I´m talking about 3Ds , obj, Quake III , gmax etc, etc modelers.
Thanks to gmax and other tools we can convert these models to our sim.
There is a lot of site with thousands of free models.

The tools needed for these conversions are:

ModelconverterX
Gmax
Modelcomander
SDK
3Dexploration.

I´m showing for example this very nice Tiger tank (original 3Ds max model) converted to cfs2