I just finished the workshop battle arc (which it was simply a brawl, no workshop-like involved), so maybe things were explained a few further on, but I doubt it.
I really don't get the tower. I can't believe this is a tower. Nothing in the series so far pointed out anything which would make the tower resemble a tower. The only concrete thing to date is the floor number, but that is too abstract to say anything.
On floor 2 Leroro gave an explanation about the tower using a cubic projection with three... side shafts. Or something. The whole outer/mid/inner section never made sense to me. How is the layout in first place?
A tower would have an outer wall. Even if it is a titanic babelx10 size tower, the outer walls would be visible. Even if they are disguised with shinsoo or whatever else, someone living in the border would bump into it. Urek made a whole group just to get out of the tower and he never tried to, I don't know, walk in a straight line until reach the outer wall and try to break it?
Other events also go totally against the tower model. When Baam and Rachel entered the tower coming from who knows where, Yuri was already on the way commenting how new irregulars had shown up. Considering she is part of Urek group, and his HQ is at 77th floor it should be impossible for her to track all the way down so quick. She was with Evan, and he is a guide, ok, but he isn't a space bender to open wormholes and travel that fast.
Another thing is the shinsoo density explanation. If shinsoo is akin to water and air, it would make no sense to be thicker the higher you climb the tower. On the contrary, it would be thinner the higher you go.
It seems like this:
The "Tower" is shaped on something like a cube;
The "floors" are no floors at all, but linked spaces. Maybe you can access any floor from any floor through some ritual the guides know intrinsically, and that's why they are coveted by any team out there;
The floors with higher density shinsoo are actually the deepest ones. The entire tower is backwards. Just like Baroque's Neuro Tower, where you go down instead of up. That would screw up Rachel goal (hey you guys would be happy with that, everyone hates the girl goddamn).
In the end, I think the tower is the planet itself, since no outer walls were ever mentioned. That would make this planet a closed space, with headon being the only resident able to open gates for outsiders (aka aliens) to drop in this reality and get stuck there for eternity. Irregulars can somehow drop in, but not get out.
I really can't grasp the tower.