You're not paying attention:
1) each mod should be individualy zipped. Just like normal, or if you did one ship at a time.
2) Pix for multiple ships can be placed in a single rar, so as said rar contains "only pix" and no mods, thus you need X number of rar files for how ever many mods, +1 more for ALL pix. When unzipping the rar/zip that contains the images, they should be foldered by ship (or if you want to rename each pic excelcior1, excelcior2, excelcior3, miranda1, miranda2, soverign1, soverign2, ect rather than folders that's fine too)