So, I have come to the conclusion that this particular song is too difficult for me to tempo map at my current 'skill' level, so I have put it on hiatus for the moment.
In the meantime I'm going to try practicing with simpler songs to see if I can get that magic 'Oh yeah!' moment where I start to understand it. In that vein, here is my newest attempt:
I am about halfway through it, and it seems to be going pretty smoothly (which terrifies me). I am using the metronome this time.
Something doesn't 'feel' quite right even though it 'seems' to be going ok, so I figured I had better post it before I get too far, in case I have fudged it somehow.
EDIT: Here is the whole map:
It gets lost near the end (or at least that is where I noticed it). Not sure why.