In answer to your four questions.
1. Yes.
2. Yes.
3. Didn't change the model. For some reason, I couldn't even see it in wings 3d - when I exported from pack3d the file size was 0kb. I am new to this after all.
4. No, the new name has a completely different number of letters; this is probably my problem :hmm: . I will give it a four letter name (the Transport's designation is NPTR) and try again tonight.