Right as promised here are some photos of the models I already have.
1 - Super Star Destroyers (the larger measures 180mm long)
2 - Interdictor
3 -Star Destroyer
4 - Assault Frigate
5 - Rebel Transports
6 - Death Star 2 (if you look carefully you can see the top and bottom do not allign perfectly, its quite a disappointing model)
7 -Nebulon B Frigate
8 - Home One (I think)
9 - Viscount (I think) (170mm long)
10 - Mon Calamari Cruiser (I think)
11 - Tantive
12 - Y wings
13 - Tie Interceptor
14 - Tie Bomber
15 - B wing
16 - Naboo Fighter
17 - A wing
18 - Shuttle Tydirium
19 - X wing
These are all larger models so can potentially be made much more detailed, but none are finished so if it was decided we wanted more shots of any of these I could bring them up to scratch. The Rebel transport is 240mm long and the cargo shuttle is 145mm long.
These are a selection of others I have, again they are quite small but who knows some might be useful.
This is a close up of some of the fighters, because they are smaller the detail is not as good and in some cases the plastic bends so again these probably wouldn't be useful as anything other than placements in shots. (Except the B Wing which isn't too bad).
This photo is just a quick close up on some areas of the super star destroyer model. Hopefully it will give you ideas of the limitations of these models. Although the detailing is good for a model of this size, and it could be improved even more by repainting it, the closer we zoom in, the more noticable it is that it isn't going to match the existing close up shots.
Anyway I hope this gives you some ideas and in the meantime I will be making a start on the Victory class ship.