Update.

Finished the exterior of the central brick building. Cleaned up the area adjacent to the big deepslate tower, created walking space there. Started creating connections between different areas so you can walk from one area to another. Got started on another massive tower, I saw a really cool build on r/MinecraftBuilds, that new huge tower is based on the reddit post.

 

Megabuild central room update. Added big pillars. The color-vomit build on the right contains a staircase. Activated the beacons so I can sprint around here now.

 

Update. Added the final pair of columns, mirror design to the opposite ones, different blocks. Every pair of columns is also an elevator/drop chute pair. The square columns go up to the first circular walkway, the taller columns (the grey ones) lead to the next level walkway, which allows access to the outside of the building.

The wall detail behind the new square columns is a compass rose and map (green is land, blue is ocean). Kinda hard to see because of the columns, but I actually don't mind it if some details of the build are hidden behind others like that, I think it gives the whole thing more depth and interest. I will be building a new map room there, hence the design.

Also, I finished the floor and I love this style of floor design. Definitely gonna use it more. It looks awesome on a large scale, especially if you're looking at it from a bit of a distance, and this megabuild is really quite big