1. Maybe take out the "he thinks it's a monster so it turns into one" power and instead just focus on the monsters under his bed and in his closet?
2. I thought it would've been made sometime in the Victorian era, so clockwork and steam would've been the best choices to power the thing. That, and there's the obvious clockwork-time relationship, though I think I could be able to change it and still keep that, some how.
3. Yeah, I can't think of anything to reply to that. I'll try and write out the SCP.
4. I was trying to put the focus more on the negative space part than people vanishing, which I put mainly because I wanted a shape besides a plain old sphere. Maybe if I changed it to just one in a remote location without anything about people vanishing? Or change it into a random ripped shape like a hole that was actually "torn" out of the world.