The enormous file size confuses me though, you should really decrease it. You don't need to have any data files or any excessive images in your mod, if you're only changing the floor plans.
Some of my FTL mods you may like, or hate, or... yeah:
Actually it still overwrites CE's greeble floors as far as I can tell. You might want to have a closer look at CE's floor images if you want to establish full compatibility.
Just FYI, you can also use this CE version with vanilla if you install normal Detailed Greebles first, they have the offsets in them and that way they don't go out of sync.
Adding offsets into this would make it usable by itself, I think.
Why is so much of the dlcBlueprintsOverwrite file inside, btw? It changes the CE ships.
@edit It seems Mantis C actually has a different floor image in greebles and ce, for some reason. Requires a different offset. Ehh.
Engi B, as well, sort of. That one's still kind of fine, though.