I've finally perfected my recipe and made a bunch of rocks
Small kiddie pool filled with DIY rock.
My daughter pointing to the one she made... all I did was tell her the amounts to mix she did the rest.
Finished rock will be posted in a couple of days.
Finally here are some pictures of my DIY rocks

I like lots of hiding places... this isn't necessarily how I'm going to set it up in my tank. The size of the rock pile is approximately 2'6" wide, 2' deep, and 2' high.