I personally find large molds are both hard to handle and tend to be "flat".
Unless you are modeling a cut through a hillside your rock surface will not be basically flat.
I like to build my support for the rock face using blue or pink foam sheets and then applying individual molds.
Your rock is great looking. I wish I had it myself.
But if I had a large one piece mold of that rock I would end up cutting it into smaller pieces.
In fact, I usually end up cutting up my Bragdon Enterprises molds to make smaller ones.
Unless you are modeling a cut through a hillside your rock surface will not be basically flat.
I like to build my support for the rock face using blue or pink foam sheets and then applying individual molds.
Your rock is great looking. I wish I had it myself.
But if I had a large one piece mold of that rock I would end up cutting it into smaller pieces.
In fact, I usually end up cutting up my Bragdon Enterprises molds to make smaller ones.