Lovely, well hidden trick. Plenty of play in the other sections too. Took a bit of experimentation to cut the last few steps even after I noticed the main motif.
Oh my goodness that is beautiful. I was stuck 6 off on what seemed like the obvious path to me, but I wasn't able to see anything else. Left it for a few days and when I came back I finally saw the idea. One of the all time greatest PP1 levels.