Just a thought... have you tried fiddling with the scale factor (and maybe the model radius) in your shipset data files? I think you have to set the scale factor pretty big or small (either something like 400 or 0.0025) for it to scale properly - Wings models are scaled to small numbers like 3 or 5 units while SE5 models are expected to be hundreds of units across, if I recall correctly... If I had a working .X viewer I'd take a look at it but the current version of the DirectX SDK only works with Windows Vista or something so I'll have to revert to an old version in order to view the model
