Yeah, this one was a big headache. One thing that helps a lot is that clones can rotate in place without dropping any trapdoors, so you can re-use paths that way. You'll still get a bit of a bottleneck at your exit location though.
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×Another tip that helps is to not exit out the east side of the trapdoor enclosure until all the clones and mirrors are out - it might seem at first like e.g. leaving at the top and re-entering at the bottom could help, but that just wastes space. Better to just have a clone approach from the west.
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×I had the most success with two clones standing diagonal to one another, so one clone could pass a mirror to another one, covering a long diagonal distance.
Let me know if you want more specific tips or a demo for this one.
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Quick links to my stuff (in case you forgot where it was):
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