Are you using any texture replacers like NMC or anything else? Try reinstalling them and see if that fixes the floor texture issues. As for the missing meshes, one of your .esps is looking for resources that are no longer in your data folder.
Let me go back over your load order and see if I can spot any mods that alter the casinos.
“Ignorance is curable, stupid is forever.” - Robert A. Heinlein