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Somehow I have one, the rest have disintegrated.
Made a first attempt below in PLA. The back wall is a little thick, the box section should be moved up a little, and the clips should stick out more.
I probably won't be able to go at it again until the weekend. Once I get it to how I like it I'll post the STL file here and post it on Shapeways.
If anyone wants to mess with it in the mean time, the STL as it is currently is attached.