Bless my daughter, she figured out what was wrong with Gmail and was able to upload the photos, so I can show you another "how I do it". As the top courses of the lower story chimney were very crooked - I marked the brick courses while the clay was flat, rather than on the chimney skeleton - I decided to take off the two top courses and re-do them somewhat more straight. For the chimney skeletons we used a scrap of 2 x 4 wood left over from a Real Life building project.
The photo of the chimney clad in smooth wet clay got lost somewhere in outer space (where do missing photos go?). This is the whole upper chimney with all the bricks marked and refined with dental tools. I made the usual mistake by missing one brick course while marking in the verticals, which you can just see on the left side of the chimney. The clay had begun to dry while I was fixing that, which meant it was not inclined to take the texturing. When the clay is completely dry, I will tidy up the edges (there is a little shrinkage, so I usually leave some extra clay top, bottom and sides). Then the next step is painting in the mortar, followed by light colour washes to differentiate the bricks a little.
I have to bevel the edges of both chimney portions a little in order to mark in the mortar line between the two sections. That could be interesting....
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