You can only estimate a model's size in polygons - physical model size is irrelevant. What does your polycounter goodie say?
But nevermind that - I expect that you have a corrupted element in the model somewhere. Use a method to isolate the object's layer by turning off half the layers and seeing what happens.....
To e certain that the 3D view works, place a camera with a plausible viewpoint using the camera tool, select it and THEN ask for a 3D view.
Dwight Atkinson