Hey, sorry if what I'm about to post has been posted, but I figured it out on my own and I rarely get to have the pleasure of that so I wanted to share it with you guys anyways. It might be hard to understand, it probably is inaccurate in terms of the arrows, but you should get the general idea.
-First picture goes with the second and third, then seperately with the fourth. The fourth.. well.. if you manage to get that far you'll be able to get to the second-furthest rafter from the far wall.
ALL jumps across walls must be done facing slightly towards the wall or fully towards the wall. Experiment and find out, seeing as that's how I did it. [This is intended to give a general idea towards the exact way of getting up there. By this I mean that I understand it's a tad confusing and inaccurate.]
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