Mine is almost exactly the one you posted, except I let the worker lemming fall onto the golden pillar and built the rest of the path instead of one very long bridge from the blue bubble. Nevertheless, both work and avoid the pickup skills completely, so they're backroutes. Yes, I looked at the Lemmini version and so I know the differences in the level layout, and for a while I couldn't remember the solution, but I was able to solve it.