personally I use only truespace, and if you just scale up the mesh, many parts goes offset from the correspondent parts of the hull (venom said there is a tool in max that can deal with this prob, I never found something similar in TS)
What you have to do is to scale all the parts individually, and you have also to subdivide the mesh to 20/40k polys and import the shield mesh from another pof at the end of editing (or you can't use modelview)... the whole thing is a bit annoying, personally I prefer to use argv's virtual shields 'till a solution will be found, in one way or the other