Two friends of mine had quite a few props but eventually sold them when they moved last time a few years ago, they had a Mugwamp, Typewriter, and the Human Centipede (That attacked the boy in the film).
I can find out if they still have photos if you are interested, that Film was very Bizarre.
I rewatched Naked Lunch recently and stumbled upon this blog post which identifies the typewriters (Clark Nova, Martinelli, etc) as real machines with new logos attached.