Finally yes I see the correct method for dealing with the lone zombie at the top via freeing him with a laser so that you can safely dig away the wooden pillar
What is different is that because of the way you did the lasering you didn't need those jumpers to more effectively keep your distance from the zombie. Nice find!
And yea, finally the start with the platforming and building is correct, with the stacker different from mine in that I use the final Lemming from the entrance to stack and contain the crowd and hence I isolated my two workers differently. And of course mining to reduce the fall and make the trip to the exit survivable is intended.
I think I eventually realized that there might be more effective ways than to build over the basher tunnel at the top, bash, and then laser through the rope net to get over the top. Indeed, your solution showed me just how much more effective than mine is in that area.
Same thing with using a basher to destroy the stack instead of a platformer to free the crowd, I somehow knew the unintended way via the former would happen. That's fine, again the solution overall is close enough that I consider it acceptable and not a major backroute like in all those previous versions.