Just reading this after all the new editions, and it's still not coming together for me.
One thing is, it isn't just 2412. Skips spilling in from alternate universe cold or global wars are incredibly common: SCP-2195, SCP-2120, SCP-2273, and SCP-1917/SCP-2117 all come from worlds equally or massively weirder than this one, and are tied to much weirder anomalies.
I'm not saying your universe or anomaly aren't interesting, but you're relying on some other basic tropes (it's a spooky factory in Eastern-ish Europe, gravity distortion isn't much more than a flawed superpower here) and there's a whole lot of page length that isn't doing anything for you at all. Now that you've added the documents that could add some flavor to it, you should really look at cutting the fat.
Edit: Added a collapsible.
Anyhow, here's my overall point: weird SCP weapons coming over from horrible wars are pretty common, and the objects themselves help tell the story of the weird and different world they came from. SCP-2195 comes from a world whose government will go to incomprehensibly horrific lengths to maintain support for their war. SCP-2117 wages war with technology bizarely superior to our own. SCP-2120 cranks out superscience like we do cat videos.
Your anomaly is decent, with some good weird imagery and body horror. Your alternate history has potential, especially when you're making cool visual statements with it. But these elements have to work together to tell a story, and right now there's too much filler on both ends.
Withholding my vote for now.