Does it (they) use the original textures? ie, Can you just stick the .mod files into the LDR folders and upgrade those as well?
No unfortunately, it has new textures. So those must be downloaded as well. You can, however, drop the .mod file into the LDR folder.
BTW Marauth, I forgot about the war cruiser, I'm redoing that one as well. So you have more to download.