There's a free model of the SR-71
here. It has one cabin whereas I saw SR-71 with two cabins, but I think that's not a problem
I opened it with Blender. Textures are presented. It has virtual cockpit with instruments. It seems there're separeted meshes that need to be animated:
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I suppose it could be easy to use in Orbiter, so if anyone wants then it could be a good add-on for Orbiter. ReadMe file in the original archive says that the plane was for using in FlightGear.
It looks the author has many
plane models.
ADDED: One more model of the author, arrows of instrumens are separated meshes, so everything seems to be simple for animation and using in Orbiter:
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