OK, I realize that it's only easy for me because I'm already intimately familiar with the geometry, and the floor templates are particularly confusing. I made separate templates for:

[_] dias, ramps, and dias step treads

[_] main landing and its step treads

[_] "ground level" floor (to the sides of the gate dias) and the lower halls, with the mezzanine floor template superimposed (but different color)

download link -> Atlantis floor templates

My intent with the combined 1st floor & mezzanine template is that you can either make a single map which would be used for both floors, or you can make separate maps for each floor.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5