that's cool for fbx !
For collisions can you use simple shapes or capsule for characters ?
How it is done : by pogram you code the collision , or it is some Visual Gizmo for that purpose ? (a la Unity 3D caspule editor ?)

I'm not sure to make some terrain based game for now ...
And the code is more complicated than simple scripts ... it seems i seen some memory management (something non programmers want to avoid , we're not in the old days ...)