Zippy's NTSC Bunker

Don't get me wrong, I want to help you. What follows is not critising

I think you should prepare really good foundations.
TheC64 Mini is different beast from classic C64.
It is crippled in some minor details, but it is also advanced in many more.

Sooner or later, "UART mod" will become standard for Mini, you should keep it in mind.
It means that specific "Carousel" (UART) format will become standard. You should be prepared for that, imho.
Beside game itself (VICE snapshot file), it contains cover, screenshot(s), description and ".tsg" configuration file.

Think of it like VICE .vsf + gamebase data files (shame it is not 1:1 compatible with gb64 right now).

Good thing is that Mini UART format is 99% compatible with Mini USB format.
.tsg files, renamed to .cjm files works 100% - all extra tags are just skipped.

IMHO, you should build your Bunkeroo database according UART games file format specifications.

I think that you can adapt gb64 database format to your specific needs (and recycle most of data that is already there).
When I said "you", I mean on community that will join and help in that task (I hope), of course, but such a project needs leadership.

Another thing that cross to my mind is that you should use good file optimizer for graphic stuff and archiving options.
Probably the best tool for this is "FileOptimizer".

There is more, of course, but this is first that came to my mind.

Fileloader specific formats, .d81 (and .d82?) multigame formats (FiBr, NAV or some other manager is requirement for Mini), EF cartridge formats...
compatibility with e.g. SD2IEC... THere are few standards that should be wisely chosen for Bunkeroo project, IMHO.

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NTSC is specific thing, with historical reasons why many games more often works better in PAL version then NTSC.
It was related to "hacker scene", that was different and probably more "stronger" in Europe then US.
Some other people could explained it better then me, from technical side of story.

Right now with Mini, things becomes opposite then that was with C64. I mean that Mini was not welcome at "european scene" as it should be (...).
Exactly the opposite of that, Mini was greeted very warmly at USA & Canada.
Things will settle down, but "NTSC" community now deserves to take a "royal scepter" for its own needs.