When running my KOTOR campaign I went with SM +7 for the Ebon Hawk. (The "This is not Milennium Falcon- Honestly!", lookalike from Knights of the Old Republic games).
Basically when trying to fit in the modules the sizes fitted a lot better into a SM +7. A SM +8 would have have made the thing way too spacy.
You can see the result in:
https://hups.kivinen.iki.fi/k2009:ebon_hawk