My custom ground in X Plane 10?

#1
I have a custom ground made with Sketchup 8 Pro which I made for FSX and Prepar3D.
Can i somehow make this custom ground work in X Plane 10?

Runways that contour with the ground and the taxiways and apron area as well.
I have not found a way to make my 3D custom ground follow the X Plane 10 ground.

Any ideas or knowledge on this?
 
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