Glad you like it! You're not missing anything, all the spinners do need to be off like you have in the screenshot, but the arrangement isn't quite right for the bottom left shape.
Thanks for the speedy reply! I'm still pretty sure I'm missing something. The two orientations I can find for the bottom left both seem to be impossible:
1) Right-facing doesn't work since it touches the top-right shape three hexes long (and that long shape can't take the other orientation since that would touch the top-left shape)
2) Left-facing doesn't work because it requires the spinner to be white (which leaves you with an extra hex)
Here's how I see it.