It took me a while to get to this point (a few mistakes and many learnings along the way), but I think its time to show the modular build (holes included) before I move on to the next videos.
Outside:
Center Aisle:
Stairs ( will lead up to another room I haven’t created yet–probably multiple rooms that would be switched out):
Inside of the Tower:
I found it really helpful to have a minimum of two types of corners – one version that lines up along the inside of the blender grid and one that lines up along the outside of the grid. I don’t know if I missed it in the videos, but this way the math works out so that with the standard floor pieces shown (2x2,4x2,4x4) I could make a floor out of just those pieces (or just one of them if you wanted to) and never need any scaling or odd spaces filling in.
Basic LOD_B Update: