So, he reinforced the floor with 2x6s, built the form and poured lots and lots of concrete:
Then, he sealed the inside and began cutting and laying the tile, starting with the drain. He's a bit of a perfectionist, so each piece was individually dry fit.
You can go here for the cost breakdown and the building process. We added lights above the-ahem- facilities and the spa. The spotlight over the toilet is a constant source of amusement for us...a friend commented that all he needed to complete the experience was a choir singing Hallelujah when he flushed:
Added two mirrors we found at Ross and spay painted to match:
Linking with Kristi @ Addicted2Decorating!