Is it not interesting because it just kills when it tries to escape, or because the concpt of a body hopping demon that transforms objects to make them more effective killing machines?
I'm not sure what to do with the meat and muskeg. I don't like the idea of this thing living perpetually off of nothing, and the idea of feeding it scraps of metal is less appealing. I picked rotting meat and muskeg because it had a "dead" vibe to it. I might try batteries or mercury, or motor oil.
The second one breaks the "if you'd want one it isn't a good SCP" but I like it for its intrinsic value.
Regarding the last one: is that a good thing or a bad thing?