I investigated converting these as I also have a GM Mini Theatre. The problem I've found is that you need to break the cartridges to run these through a normal 8mm projector. Having to put the film back into the cartridge once done is a feat in its self as the cartridge is continuous playing and the film must go in a special way. I've started to convert mine ant have about 16 films on YouTube however quality isn't great as I've simply filmed the image on a wall using a video camera (very basic I know). If anyone wants to watch the films I've downloaded just type in GMHNUT in the search area in YouTube and they'll all appear.