Position of Form in Step 10

Can anyone provide clarification on Step 10 of the instructions for the Mattone Barile Grande pizza oven? The text says to place the form 10.5 inches from the edge of the rear firebrick. However, the diagram appears to show it 10.5 inches from the back of the oven/standard brick.

I’m assuming that the picture is correct? And the text is a typo?

A screen shot of Step 10 for reference.

You are correct, it is from the edge of the standard brick (from the outside edge).

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Yes, that does appear to be a typo. The form should be just inside the hearth, and when you build the firebrick of the arch will straddle the brick frame and the hearth.

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