I created these for the Blender Market and CGTrader, I got each shell set up with subdivision surface and displacement modifiers in Blender so it brought the memory usage and file size down dramatically from what I originally had in Photoscan. Not much I can do about the tiff textures though but I did have an excuse for those to be 8 bit instead of 16 bit which also helped. There was also the mesh/texture cleanup work and Blenders texture tools really helped for that
Individual renders -
https://www.artstation.com/artwork/E0RKA