I've now completed this but am just am 99.9% sure I have the correct letter.
My slight doubt comes from the fact that some posts seem to be saying the turtle has drawn a symmetrical letter and others that it hasn't.
I'm keen to avoid spoilers so I'll word this next bit carefully.
If I have the letter as I've drawn it in front of me in its usual orientation, and draw a horizontal line midway between the very top and very bottom, then the top and bottom halves are definitely not symmetrical.
Also, while the bottom most line does intersect the first line heading in the direction given by the initial letters of the extra words, there doesn't seem to be any indication of a "full stop".
Basically, what I'm saying is, I had thought the final line would intersect the first R or L thus creating an eternal loop but, at least in my interpreation, that doesn't appear to be the case.
None of the above is meant to be a critcism of Qaos, the puzzle was very enjoyable. Rather, it's just me checking I've got the correct letter.