ATM [~OT] Roll film holder plans?

[matt@considine.net]

Hi,

Does anyone know of 'net plans for a roll-film holder/camera body?  I'm
looking for something that could be made by an amateur and would incorporate
some sort of film advance mechanism.  The ATM relevance is that it would be
used on a telescope to replace a heavier commercial camera body.  I guess
the part I can't figure out myself is a simple, clean film tensioning and 
advance mechanism.  Anyone with any thoughts?

Regards,
Matt
Considine