Im actually gonna go with Martins idea of having the button on the top, this way I can make interchangeable outers (different match manufacturers) plus I can hide the on/off switch inside.
Thanks Martin
If anyone fancies a go, here is my latest image.
(Click for high res version)
Just make a box, print this out on self adhesive photo paper and stick it on
The alignment marks are just so that once you've peeled the backing off you can align it easier on the box ensuring its nice and straight.
Ron