Portal 2 - sp_a2_bts5 - Theory
If you can get up to the edge of the wall platform spawning area (I noclip to get there in this video), then you could portal to the area where it de-spawns the ceiling platforms. Then, you jump and bunny hop off of an invisible clipbrush (it is actually really easy to do). The level load trigger is just on the other side of the door that breaks normally. Hit it, and you are home free. It would be great if someone figured out a way to get up to that edge. Objects cannot be brought from the previous level, as it de-spawns them at level load.
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Currently, Michael Yanni has 2,997,196 views for Portal 2 across 142 videos. His channel currently has around 22 hours worth of content for Portal 2, roughly 19.29% of the content that Michael Yanni has uploaded to YouTube.

