Taxing 8, assigning skills to only 1 lemming
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The main trick is at the beginning, illustrated by the first screenshot.  You
build at the location seen in the screenshot, then when you've gotten close enough 
to the thin wall above the leftmost of the 4 "balls", close enough without the bridge 
connecting to the thin wall, you bash.  The bash stroke will be close enough to break 
through the thin wall a bit above ground level, then your basher will fall because 
the bridge doesn't connect to the thin wall.  Now your worker can climb up to get 
through the break you created earlier in the thin wall via bashing, isolating him 
from the crowd to work on the rest of the solution.

The remaining screenshots should tell the rest of the story.