No change to the floor, after all? The light grey lines look a little strange when I think about what they are doing, but not necessarily bad. They really add to the texture, and, with a few alterations, it might be a really good way to show mortar in a floor.
Nice build, aside from the messy flooring. Like I said to Gilbert, it would be better if the top layer was all dark grey and the light grey was below it; I see what you tried to do but it looks messy and the mortar (or whatever) is too thick.