I stopped when I ran out of the right-hand wing triangles.
In the past I have found this a very difficult unit, but it's going more easily this time. Vireya has pointed out that Lorna McMahon at https://sewfreshquilts.blogspot.com has a tutorial for making this block . Anyone having difficulty in finishing with a straight line hypotenuse might find using Lorna's pattern a good idea. You don't need the complete Happy-go-Lucky block obviously, just these triangles. It's best to read both these posts as Vireya gives some hints on using Lorna's pattern in this context.
It's tempting to try to guess the final layout, but that is still a mystery.
I shall be linking up later today to:
so click on the button to see more winged triangles,
and not all aqua and brown!