If I am not mistaken, 3000 contest entries should address the SCP as SCP-3000. I think abiding by the rules would help the entry.
Alright… at first glance, you have established clear imagery. I didn't really care much for the journal entries, for I do not feel there is much interesting points there. The presence of the WTC buildings caught me off guard, and I think I would like to know what other things are inside that world.
Regarding -2, I think it is simply left there and you did not really go back to it. You can talk about the materials it is made of, maybe to enhance the level of horror and provide buildup to your end point.
Overall, there is a small hint of unsettling-ness towards the end, but it came off as a last-minute jolt than with buildup.