your .model file is correct, this objects are away to big - you need to scale down 0.001 - 0.002,
(couch: verts:88.000 faces:88.000 Tris: 177.000 - thats as much or more than your whole Wollaton Hall )
Ah. So much for complex furniture, huh? Oh well. Maybe someday. The flat square couch is just not very appropriate to my build. Too bad. I guess I can try building them in game. (Laughs)