...Though they are still not quite usable. I still have to plan out and execute the smock, including some further blackwork (in white!) for the neckline. But the cuffs themselves are all finished and only need to be gathered, trimmed, and sewn to their final resting place.
The first step after the embroidery proper was finished was putting the smallest possible rolled hem around the edges. For this I used 100/3 Londonderry linen thread waxed with some beeswax.
Then came the needle lace -- though it's a pretty generous term for what is basically a variant on a blanket stitch. This has the double benefit of giving a nice finished edge to the cuffs (and the neckline, when that gets finished) as well as giving some strength to the linen edge, since it's basically tied in double knots every eight threads.
And here's the finished cuffs after a quick hot water wash and some pressing. From here they'll be mounted on a mat board for competition and display until they are ready to actually become clothing.
Part of me is still just glad and sort of amazed that I actually managed to finish them.