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I've finally got this in a state where I think it's worth considering. Here's what it looks like at the moment:

https://www.dropbox.com/s/y6rgugchx4blws3/Screenshot%202014-02-26%2003.36.29.png
https://www.dropbox.com/s/qz4fnoqnw17wwtk/Screenshot%202014-02-26%2003.36.52.png
https://www.dropbox.com/s/s6gjjmqa1nrqcpj/Screenshot%202014-02-26%2003.37.10.png

Feedback welcome!