13x18 cm ICA metal casettes and Pinhole

[nehartmannn]

I had the luck to by 4 13x18 ICA metal casettes... (and a lot of other casettes)
I would like to build a Pinhole-camera for those casettes...
And do anyone have a 'blueprint' or something else, witch I can use for inspiration or a link to something.....:rolleyes:
My problem is to the have the casettes fit lighttight onto the camera.....

Thanks

Niels-Erik

PS I have build pinhole's before please look at http://nehartmann.dk/Pinhole%20Photography.htm
n-e