I did some more work on updating levels and more questions appeared:
1) Level 10 in joem3.dat by Joe Sentinel seems impossible to me. My best solution is still 6 lemmings short of the save requirement. Does anyone have a solution to this level? The NeoLemmix conversion (with slightly different trigger areas!) is attached.
2) Some of the other levels by Joe Sentinel seem to use a non-standard style. They are level 9 in joem5.dat, level 6 in joem6.dat, levels 4, 7 and 9 in joem 9.dat. I already tried all L1, ONML and Holiday styles without success.
3) Does anyone have (intended) solutions to the two level packs by siergiej?