This one was surprisingly tricky - as it turned out, the path I was trying to go down for a while was quite close to the correct one, but off in a meaningful way.
I was 2 off, for a very long time, here. Had two very different 2 offs. David's 36 was just hidden from my sight, somehow.
After solving it wasn't clear to me, why I couldn't see it sooner. :)
I liked to solve it (had no 2 off), but for me, the bottom part with all its loops isn't necessary. It just makes it longer for nothing. Would have preferred it straight. This wouldn't spoil the concept that is in upper section.