No documentation in the strict sense of precisely duplicated features of one particular Snipe. Instead I'm going for an "authentic impression" based on whatever informtion I can pull together from the recourses available (datafine and photos from the web). So far none of these offer an unambiguous method for the lacing on the Snipe.

But I'm leaning towards the double lacing for the following reasons: 1) it looks neat 2) It make sense that they would have done it this way for the same reason that they did the "back stitching" on the cockpit, that is, dependability and 3) there are zig-zags on the datafile drawings. But I'm guessing that this got done in different ways on different Snipes by different field mechanics.

Here are three more photos that show other ways of doing the lacing. The first is on a BE2 and the lacing goes in an out of the seam. The other two are of the Bristol Fighter where the lacing goes back and forth across hooks. This appears to be similar to what was done on the vertical seam on the Snipe.