We should revisit the concept of flight tubes in http://community.istaria.com/forum/s...ad.php?t=11184 . It seems that the reverse spiral could be modified as such:
Tier 1/2 - 3 levels
Tier 3/4 - 5 levels
Tier 5/6 - 7 levels
They could follow the current pattern of resource needs for the rooms with machines. A "marbling" of blue or red (and bluish/reddish) would differentiate Helian vs. Lunus.
I'd like to see many connection points to allow for murals and flexibility in connecting structures.
Also, the machine rooms are rather nice without the machines. While I don't understand the limit of 1 per type (Helian, Lunus and tier), it would be great to have tier 2 stoneworking chambers as a colorful hallway and smelting just to break up the repetition of halls, 3 ways, and 4 ways. Ideally their resource requirements would be about 1/2 to 3/4 of their machine "cousins."