Siodach - I was thinking the bonus HST wouldn't play nicely with the other sizes we've been making but then I realized when sew into the quilt, 3 bonus HST = 2 of the other units so maybe the HST are part of some sashing.
Cheesehead - your units look great!
I re-read Clue #3 a few times then tried 3 methods - none of which included bonus triangles. I'll make those separately.
1) drawing a line, flipping the corner
2) taking the green rectangle, trimming the diagonal corners off then sewing a half triangle to each end
3) making parallelograms from a green strip then sewing a half triangle to each end
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All 3 units came out the correct size so I'm going with method 3. I can use the beginning and ending triangle for the bonus HSTs, I won't have to draw any lines, and I will have almost no wasted fabric.