1611 is jumbled and contradicts itself a little, I understand it is a rough draft. It is pretty similar to a number of bigger-on-the-inside places already here. It doesn't have a solid hook for me. It reminds me (a little) of an episode of the original Twilight Zone. A good example of a bigger-on-the-inside SCP (it was bad and about to be deleted and then was rewritten) is 967. The occupants are what make it interesting.
The shower that must be used and causes accidents. Well, maybe, but I think it needs to go off in a different direction to work. I don't think there are any shower SCPs, but we have 1 or 2 bathtubs.
The feather duster just doesn't work for me at all.
I think I commented on the others before.