The picture and the text produced a screen too wide to be seen in one screen. I have tried to fix that, attached the photo, and copied your text below (somewhat edited to maintain the substance). I hope it works.
I will leave the plumbing suggestions to the Master Plumbers who visit this site.
It looks like you have virtually destroyed the structural support. You may have to rebuild the floor structure with enough depth to support your planned renovation and provide enough depth for the plumbing. If you go to the following link http://johnbridge.com/vbulletin/index.php you will find that you need a pretty good structure to support tile.
Originally Posted by tgillson