I'll post a demo, but there's actually a relatively straightforward way of doing this one once you know what you are going for.
Your main goal is to get the roach queens to spawn at
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×(16,8) and (34,8) so that you can get roaches to move diagonally and line up behind the obstacles at (18,6) and (32,6).
To get them to spawn there is mostly a matter of counting. Since the roaches are directly in a column below you just time moving a queen to the east and to the west so that they hit the right spots on turn 30. Follow the queens down then do the following.
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×West on turn 18 to move one queen east then back to column 22 on the next turn. East on turn 24 to move the other queen west, then quickly get down to row 8 so that she doesn't go SW. One last detail, you need your sword pointing SW and to have Beethro on (18,8) on turn 30 so that the queen doesn't spawn in the little nook to her southeast.
Lastly, once the roaches have spawned get them spaced out correctly.
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×Move up to row 6. You'll need to move down and up once to get them correctly spaced. I mess this up in my demo and do it inefficiently.
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Links to neat forum tools that I always have trouble finding:
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