i recently tried playing the new stalker modpack, i think it's called Gamma, but i might be confusing it with Misery - it's a mixture of the 3 original games, got all the maps united together and a fusion of the stories of the original series.
... andd they also added some obscenely difficult reality changes where weapons degrade (unrealistically fast), and you need the parts to fix them, the wrenches, the workbenches, the lubricating oil, then you don't have the skills to repair, then you need food, water, medicine, sleep, and then there's the carry weight which makes having all of the above impossible. I tried, but just couldn't cope with being surrounded by monsters with no weapons, no ammo, no money, and no chance to acquire any of that.