Well, I have just the Destiny KIT and maybe it will be possible to make 9cm Daedalus and 10cm Ra pyramid (thats 1:2500 scale). All other ships will be either too big or too small --> Wraith hive 4.4m, Anubis super ship 2.2m, Atlantis 1.5m, Aurrora 1.4m, Asgard Oneill 0.6m, Asgard Bilskirnir 0.56m, Daniel Jackson 0.4m, Al’kesh 0.014m (1.4cm), Puddle jumper 0.0032 (0.32cm).
That is the main reason why I didn't make ships in same scale, because it would be either too big or too small. I make reasonable sizes, that are not in scale in each other, but at least you can see the details and dont neet a magnifying glass or whole room for it.
For example now I Am preparing 9cm miniatures see on attached photo