I actually am nearly copying your method Jess :crackup: Travertine as supports and another tile like the main floor ones. If I could draw or get it set up without issues like I ran into today... I could show pictures. Sadly even my drawings are extremely crude and barely could be considered 2 dimensional.
Not sure how well you can picture things in your mind, but looking at the front of a 20 long, all the way to one side I put the humid hide(Actual dimensions of HH are 9.75"L x 6.5"W x 3.5"H). It stretches from the front to the back with around a 1" gap left between hide and glass.To fill that in I took 7"L x 3.6"W travertine and laid them so the 3.6 is the height. Place those in between the glass and HH both front and back of the tank. On top of those support frames I laid another 12 x 12 (Actually 11.81 but who is counting.) as a floor level. On top of that went the regular dry hides.
Again, not sure how well you can picture things, but that is the base idea I am working on. It is still in progress though. Today was just phase one of my testing. Arya showed me that I still have work to do just on getting the framing down. Apollo I do not want to test anything on because he is so moody about things moving in his tank. Plus Arya is much more active than he is and will enjoy the climbing more I believe.