The virtual cockpit is part of the aircraft model file, not a separately added file set like the 2D cockpit.
I've heard that FSX aircraft can be designed with a movable virtual cockpit, but I've not yet come across any so designed.
It IS possible to use the default B737_800_interior.mdl with another exterior model, but ONLY if the exterior model is purpose-built and compiled using the new FSX xtomdl.exe program.
IOW, you cannot take a FS9 2d only model and combine it with the default 737's interior model.
Gauge Programming - 3d Modeling Military Visualizations
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ah ok guys, thanks for the info!