How to use navmesh on system meshes?

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:bust_in_silhouette: Asked By EmergencyRoomPanda

When using navmesh on system meshes, like box meshes or an assembly of them
the navmesh hovers over the physical bodies and seems to be inverted.

floating navmesh: Imgur: The magic of the Internet

From the examples I have seen navmesh used to have options on how to organize the mesh/level relative to the navigation node.

Does anyone know if I will be able to use system meshes for navmeshable levels without the use of external software like blender?

If so, what is the process for doing this? I Have already explored the official 3D navmesh demo but would like a more in depth tutorial.

Any help or direction would be greatly appreciated.