I haven't made the Diderot stays, but I've made the J. P. Ryan half-boned stays, which also have horizontal bones. I don't remember any special instructions; I just started and stopped the stitching appropriately and they just cross each other.
ETA: Haha, look here in the comments: http://www.modehistorique.com/blog/?p=1371 Kendra (demode) says to patch in an extra piece of canvas.
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Date: 2013-01-16 02:01 pm (UTC)ETA: Haha, look here in the comments: http://www.modehistorique.com/blog/?p=1371 Kendra (demode) says to patch in an extra piece of canvas.