introduction to armed concrete fake rock project

hello,
I want to build a fake rock outdoors (example this erratic block:
http://gsc.nrcan.gc.ca/landscapes/photos/jveillet/img0049.jpg ) the size is 6 x 8 m and about 5 m high. it will be hollow and will be accessible as a kind of cave. I admit I have never worked with concrete. (I'm rather a wood specialist)
I imagined to build a frame of iron and then spray the concrete on both sides for a total thickness of about 15 to 20 cm.
I do not know if I need to build foundations? is there a problem of humidity, venting? how hard is it to do a nice finish of fake rock? is only 15 cm thick enough? How do I estimate my time for the production of such a piece? where do I find a basic builder vocabulary ? any good source book for me to read this winter?
I am looking for general advice, errors from beginner to avoid tricks, corporations and others.
see you, gregory
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What is the purpose? I don't have a clue how to do it but I'm curious as to why someone would do this.
Olddog
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Water features, landscaping, etc. Boulders are expensive too purchase, but faux rocks are easy to make. The ones I've seen constructed were made with 3/8" galvanized mesh. Shaped to size...
Once you have the shape, then a three coat of stucco/motar.
Samples like used in the desert: (photo gallery).
http://rockmaker.com/gallery
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wrote:

Those look cool,
Olddog
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