I did see that video. Think back to when you started your layout, it is amazing what you have done. I have followed you layout since you painted the walls and started the benchwork. It sort of reminds me of my friends layout in Missouri. He also has his entire basement, around 2,800 square feet, full of his empire. I can remember visiting hime about 25 years ago and helping him with his bench work. We manage to get by at least every couple of years and like yours, watched the layout bloom.
Do you have anyone helping you with the build? It seems a bit overwhelming for one person to get all of that work done. My friend did have a lot of help from members of his model railroad club and now has an outstanding layout.