Great Tutorial, Rory,
however the bizarre thing is, that the authors of cu3er want to forbid themes to be offered that already include support for cu3er (I do not mean shipping cu3er with a theme, but including a nice WP backend for configuration). I personally do not think that this is a positive step and since a lot of people have troubles with WP integration, forbidding professional templates to at least include a backend for cu3er does not seem logical, since it will heighten the number of support requests to the authors.
So I really hope, that rorys' tutorial helps those wanting to include cu3er into their WP installation.
My 2cents,
Oliver