(help needed) making workshop objects: foundation

[Impytus]

More specifically Im trying to create a workshop item that operates the same as a foundation.

 

To ellaborate further, the foundation item is separated by the wood and the concrete bit. The concrete bit can sink into the ground or any other object when trying to construct it. the wooden bit won't and normal collision detection applies.

 

I'm using 3ds max with the NIF_EXporter tools and have no trouble with the basics.

 

I just cant seem to work out exactly what determines how this specific thing works and am wondering if anybody has any experience with it?

To be honest I think I'm missing something entirely when it comes to making workshop items. Are they even supposed to be static objects (collsion group)? The results I'm getting arent even slightly what I was expecting. The only way i can place my created object in the workshop mode is with the 0,0,0 of the object snapped to the terrain

 

 

Thanks