Hopefully it is not down for good, but it gives you the source. This guy has incredible work, and uses a very interesting technique for the structure or armiture of the rock, and his textures ideas are very interesting.
http://www.calyx.com.au/fake_rocks.html
His keithtutor.com site is currently down though...
This site is very good too...
http://www.rockandwater.com/
I have not got the new edition to his book, but have read the first book.
Honestly I have learned the most from JPJ mail-order DVD's. they put me to sleep a lot of times, but he covered everything I wanted to know and more. His rocks look fabulous. The price is pretty steep, but I do think it was worth it considering the number of DVDs and information covered. I feel like after watching these, I would be wasting my time attending any hands on sessions. The materials are too inexpensive to waste money on seminars, really.
I would try them again. JPJ sent me fliers about every month, and the finally offered the DVD's and manual for just under $400. That got me off the fence, so to speak.
Your rocks look very nice, but if you should ever want to dig in deeper and see what else is outt there, look into those sources.
John E.