I used bird wire and worked my way up just attaching it to itself and then folding the mesh over itself to form the dome shape. It came out a good shape, must have been beginners luck.

My thinking was I wanted to be able to get some vermicrete behind the wire and this way I was able to do that and get a decent result. Once the vermicrete goes off it all firms up and the render covers the lot.
Here are a couple of pics of that part of the project. Hope they help.
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