Good job!
I'm actually kinda glad I don't have to spend too much further time on working out a 100% solution, although I might still try to finish what I was working on and see how my solution work out (as well as making it possible to compare with your solution).
I doubt I'll take the next step, given that I was counting on having the 4 or so climbers to help "tidy up". Without climbers, you're left with only floaters, RR changes, and maybe the spare builder or two to influence how to compress the lemmings together, and looks like it would take a lot more experimentation to work things out.