Do a search on this forum for "fake rock" there are many threads. Unfortunately many of the photo links don't work. I've added a link to one that has a very good discription. I think I use to have a link on another computer to a site that made fake rocks. I'll look for that link. Billie

Here is a link that might be useful: make a fake rock

Thankyou, that is a good one. I read that and that seemed to sink in more than the rest. My question is, is after you droop the chicken wire over that and connect it to the other side, however many times it takes to cover it, is that wire going to be stronger enough to handle the weight of the mixture? Keep in mind, I've never done this before and maybe I'm not comprehending everything.

If you read that thread the people that did the large rocks placed their wire armatures over trash cans draped with plastic or filled plastic bags with styrofoam peanuts. You just need something for a temporary backing but it can't be too tall. The wire armature base has to touch the ground/work surface. If you can't smooth on a thin covering on the wire, make hamburger patties and smoosh them into the wire. Try to make the patties all the same size. You don't have to completely cover the wire on the first layer. You can even make the first layer look like a crossword puzzle when you place the patties. The second layer, you can fill in with patties any holes you left in the first layer and put a thin coating over the patties from the first layer to smooth out the surface. This may be enough layers to form your rock, if not add a third and final layer to smooth everything out.
When you make the hypertufa or mortar mix for the first layer you want the consistence of a soft dough. Don't add too much water. The second layer can be a thinner consistence for smoothing over the first layer. You should be able to put all the layers on in one day. Very large rocks can be a lot of work if you've never done this before so get someone ot help you.
After you put on the first layer, drape a plastic bag over the piece and let setup for about an hour (this depends on how warm it is in your area....oh and work in the shade so the piece doesn't setup too fast), remove the plastic, spritz with water and add your second layer. Repeat covering with plastic, etc if you have to add a third layer.
You might want to experiment with something smaller before moving on to something large. Billie