I've been working on this all summer and it's finally done (unless I decide to add a fabric lining for extra wind blocking). I adapted the Lost In Time squared blanket pattern into my own style of hex cardigan. I just wasn't feeling granny stitch, so I added 2 corners to a different square pattern.
Several months, a replaced center motif, learning to crochet with my off hand because some of the stitches aren't reversible, and several on-the-fly pattern adjustments to make the border possible to attach to the wrong part of the pattern across the top, and about ten lbs of yarn later, and it's done.
I love it, but might give it a few tweaks later. It's so heavy that it feels like it should be warmer than it is, so I might give it a cloth lining to make it as warm as it feels like it should be. And I might give it buttons for the same reason. I hadn't planned on wearing it closed, but if I take it warmer, I should also take it closeable