Ok, my last comment for tonight
Your probably going to need a atom for zone related information such as the zone name, far clipping plane, sky colour or texture or whatever, fog type & colour.
And also if you want this to be an extensible file format I think you should have some way for each atom to indicate if that atom MUST be understood by the loader. For example you might add a new atom with lighting information. An old loader could still load and show the zone without lighting just by ignoring the atom. Or you might introduce a new and improved 'VER2' vertex information atom. If the loader sees this and doesn't know about it then it can't continue.
I'd suggest making the atom name upper case if the loader is required to understand the contents and lower case if the loader can plausibly render the zone while ignoring the contents. For example the octree information might be lower case because a renderer which doesn't understant that atom type could still render the zone (just more slowly)
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