Due to the way the excursion funnels are programmed, the cube will follow a different path depending on whether it was put in before or after the intersection. Kind of counterintuitive, but they keep changing the way it works... Sorry this one was a bit fiddly for you, and thanks for persevering!

You know, there are portal maps which takes you time to solve, but at the end you look at it, and say "Wow, I lost two hours, but damn, that was fun." After finishing this, all I can say is "Wow, I lost two hours.".
Srsly, I've seen maps, which focus on precise placement of a reflection cube, but here you got to be perfect in all three dimensions, not even one degree off. And after, really, two hours, that takes the whole fun out of it. The only clever thing was that upon entering the angled infinite funnel, the cube rotates 90 degrees, so it can change the direction. But that requires perfect cube placement. In case you haven't noticed, Valve did not do a very good job with precise manoeuvring the cubes, so this map is now a new definition of pain in the ass for me. Also, there is a bug, I think. In the second chamber, once a cube is put into the funnel, sometimes it gets pressed to the glass wall, and becomes stuck.

the first room was okay and it worked the first time, the second took me three goes to get the cube to stay aligned in the tractor. As for the exit door, i'm not sure of the intended for that so I just stacked and jumped. cheers