My (mostly) new solutions for levels 5-10, played in Lemmix Custom Lemmings viewer style as usually.
Pillar of Lemkind spoilers:
In Lemmix, this solution is impossible because of RR99 and the lack of directional select: Use möbius' Inventions and Dimensions or ccexplore's 100% Built by Lixes builder set-up at the beginning, the first builder in the holding pit directing to the left, then a falling lemming builds two times to the wall, bashes, builds to the exit, and a blocker turns the crowd on the builder set-up.