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I only got acquainted with the books, so I will base the setting on the games, but I won't take events that are already described there; instead, I will try to present a different storyline in the same world based on them.
My idea is that to the east or west of the Chernobyl Nuclear Power Plant, after Strelok and his company + military + all other adventurers penetrate the center of the Zone, a powerful surge is approaching, which forces stalkers from various factions and beliefs operating in this area to hide in an abandoned bunker. And there, internal conflicts will begin...
In short, you can read the synopsis yourself; I won't spoil it for you.
I hope you will find it interesting to play.
Added 7 minutes later
The problem, though, will be finding the necessary art.
If necessary, I will have to run the game without illustrations.