This is not guaranteed to work, but there are some choices you can make in the middle that can let you vary things a little. I did it on the N side, but it should be similar on the S.
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×At turn 29, you want to be next to one end of the arrowed constructs, with a single file of constructs on your other side. Well, single file at first, at the end it will probably be more complicated.
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×You can set this up on either side. It's easier to set up on the NW, but you can run into problems with the northern trapdoor pit getting in the way.
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×Start by drawing the constructs to the east or west side, then lead them up past the brains' rooms in the corners.
Make a wall at the (1+3)s, and ensure the live ones are all in the corridor.
Wait until spawn, then make a wall at (2+3). Stand next to the 2 with your sword diagonally north to block the constructs.
Wait until the correct time (maybe tick 20-ish), then head east or west, so that only 1 construct can get past the barrier at a time. You want to kill your first follower or the first arrowed construct on turn 29. If coming from the east, kill your first followed on the diagonal arrow, otherwise someone might get stuck on it later.
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×Keep your sword diagonally north. Here is where you have choices.
After killing an arrowed construct, you can either
->
move sideways to kill the next arrowed construct (leaving a gap in the second row), or
->
move down then diagonally up to kill a follower, then an arrowed construct.
Ideally you want to do down and diagonal most often, because then you'll have fewer to deal with after the arrows, but you'll most likely have clumps of followers at the end, so leaving a gap in the follower corpses can help to straighten the clumps out.
Where you leave gaps is the bit where it's a bit of trial and error, unfortunately. Checkpoint before you set up the second wall, or undo.
Here's an example of what I mean, you can see 3 gaps.
[Last edited by Rabscuttle at 05-09-2020 12:30 PM]