pinhole camera design help

I am new to this mailing list. (and to pinhole cameras for that matter)

i am working on a promotional photo project and would like to offer
a simple pinhole camera to our clients for fun.

our idea is to use a 4x5 film box to ship everything in as well
as house the camera. this gives us about 1 inch between the
film and the pinhole.

would something like this work? especially for first time
pinhole camera users..

thanks
bryan alexander