Digging the concept, it has a kind of creative "lair" feel to it. One thing bothering me with the model so far is the thickness of the tiled floor. It's making the scale seem a bit on the small side.
Are you refering to the thickness of the tiles or the size of the step going down to the resesses part of the floor? The tiles are 3/8" thick and there's a 5.5" step down to the resessed part of the floor. Tiles are also 12"x12". The room is about 40'x40'.
Don't be satisfied with what you can do but rather strive to do the things you can't do!
Exceed Expectations!