I've been working on this in the meantime, it looks like IchoTolot and I both used the same trick coincidentally: I removed some of the updraft on my level to solve the problem - and as can be seen in the video IchoTolot linked, he places the stoner just barely outside the updraft when the glider starts sinking down again. This way, the petrified "head" of the stoner touches the feet of the succeeding gliders, making them turn, whereas the "feet" of the stoner don't seem to suffice.
I have attached the ray_snow.dat for Nepster as well as the rehawl of the level, this time with a successful replay
. It has some nasty surprise up its sleeve towards the end even after that stoner trick, once that slowfreeze pit is completely filled up and the Zombies start coming towards you again
. I kinda solved it by accident thanks to the remaining Cloners, Stoners, and Builders, but just decided to leave it this way after managing to solve it a second time in the same manner (which is the replay attached).
PS: My personal version of the level obviously had the Imperial March as background music, but since that's copyrighted stuff, that one will be for private use only, I fear
. Feel free to play this with any music of your individual taste
.