Your actual display is smaller, however the thing thing drives it (have no idea what it's called) is smaller on mine.

Edit: I cant find your display Simon. Would you mind re-publishing it?

Edit 2: Sg, your dot matrix is awesome, however it lacks an easily customizable input. For yours, one would have to reconfigure the whole driver just to get a different letter. This is were a 7-seg display beets it.

Edit 3: If this could be done without walls and if we could add a way to refresh, it could be a viable input system.