Flying Vehicle Models - Required Nodes

What are the minimum required nodes that a DTS model must have in order to be used as a FlyingVehicle?

We have some 3D models that we've added bounds to, but when we try to set the shapefile in the datablock to reference those models it crashes Torque out to the desktop. When we substitute a DTS model supplied in a GG resource, such as the flyer.dts, then it works. I noticed that the flyer.dts model has mount0, mount1, base1, start01 and other nodes. Which nodes are required?

We know the DTS models we are using are good because we can load them as Static Shapes and they are fully textured with a bounds box. The only thing we can think is that there are some nodes missing. Or are we simply way off base and it is something else entirely?

Note that Torque is crashing right after it loads the .cs file containing the FlyingVehicle datablock:

...
...
Loading compiled script game/server/scripts/player.cs.
Loading compiled script game/data/shapes/player/player.cs.
Validation required for shape: game/data/shapes/player/player.dts
Loading compiled script game/server/scripts/flyervehicle.cs.

console.log ends right at that point so we figure it must be something with the model and missing nodes.

Any tips or links to resources that any of you can provide will be greatly appreciated!

-Robert