This photo shows the right front of the jacket, and the first bit of the collar. I really wish I'd done a practice swatch for this. As it is, the largest part of the entrelac taught me these lessons:

1. From what I can tell on "normal" Tunisian, folks are most likely to have a problem with the piece distorting on the right edge, because that's the part that gets jostled and stretched and abused the most as a row is worked. For these little triangles, though, the bit I have had to watch the most closely is the final loop into the edging. If I make that stitch as tight as I can, the entire appearance of the trim is more regular and stable. Alas I didn't realize that for most of the "main trim," so my triangles are a bit wobbly. Luckily the colors I'm using for the contrasting trim are close enough to the main yarn -- predominantly terra cotta -- that it doesn't show up much.] And I'm hoping that as the jacket is worn, everything with settle into a shape (go gravity) where the wobble doesn't show much. But if I was using yarns with more dramatic contrast I'd be frogging a lot.
2. Probably because of the looseness in its foundation, my edging seems a little less stable than I assumed it would be. Depending on how the first couple of squares go for the collar, I may use my M sized hook for the squares, so they'll be a little tighter than the N as directed.
3. Again, possibly because of this "last stitch looseness," the rhythmic triangle and square shapes were not quite as defined as I wanted. So when I did the last round of single crochet around the entire edge, I frequently skipped one or two stitches in the "bottom" between two squares, basically making the entire single stitch edging the first round of a ripple afghan.

A closeup of the collar and top front right. I still have to do the final row of single crochet around the collar, and the cuffs.

For the collar I did watch the looseness in my foundation triangles, and I did use a size M for the squares. I've cleverly photographed these shots to minimize the difference in appearance between the front and collar trims, but it will probably be more visible when I get the "it's done!" pictures together. I do like the way the collar looks better.