Yup, it’s implemented and that was a pain!
Just coming up with a new stitch is only ~1/4 of the work. Then you have to figure out how to create reasonably neat side edges. …Then you have to figure out how to keep the material from slanting into a trapezoidal shape. …Then you need to work on neatening up the edges again.
So now I know–those ladies are just amazing (!), to manage to sell Tunisian crochet patterns that are within the reach of newbies.
The material for the bag, before I seamed & zippered it:
As you can see, it’s nothing like perfect. That was my 5th go-round, so I was starting to tire of the project.
You can also see the purl stitch that I threw in, which is something of a victory for me. This is the first project that I managed to complete without finishing it in conventional crochet.
These are pictures of the finished item, crammed full of the stuff that I’ve been losing to the bottom of my purse.
Sooooo, I’m counting this one as a success.