I know this isn't much yet, but I'm still percolating.
The structure can now be navigated top to bottom, with proper vertical and horizontal room exits. They're just doorways and steps for now.
Still have to reconnect blocks, but soon it will be a massive contiguous tower.
Going to have to break out the pro trial soon because the lack of occlusion is already causing issues.

One of the other reasons why I started a bigger project was because I reasoned that if I slowed down on it at all I might want to work on other smaller projects.
Turns out I was right.