So for the ones who voted green, here it is!
Those sharp inward curves were a bit troublesome...
I had to to use some single-shuttle split rings to make a sharp turn.
The advantage of a one shuttle pattern, I realised, is that you never have
to rewind your shuttle - and rewinding the shuttle when making chains,
is the one thing that slows tatting down the most for me.
So although this is a fine thread (size 80),
I could make progress quite quickly.
The border pattern is from the Tatter's Treasure Chest.