One other thought that will make your large format life more enjoyable.
Allow for vagueness, embrace it.
For example your question about which hole and my answer of whatever. The real work that the framework of your camera does is position the lens and film in space.
You could, and some have, mount a lens on one tripod and the film on another and stretch a bellows between the two to make a camera.
The framework of your camera is just there to make it easier than that. There is no right or wrong way to use it.
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