Hybrid Theory

[Epsilon]

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And the Perfect S-H is almost incomprehensibly more powerful than anything any Street Fighter character has ever done

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Akuma sank an island with one punch, chopped a moutain in two and sank a nuclear submarine by accident while training at the bottom of the ocean.
While the ki blasts of Ranma exist they are certainly not the same as the ki blasts of King of Fighters. The ability to throw a true projectile energy burst (which nobody but Herb and Saffron do in the entire series) is a big thing in Ranma 1/2. So big that while people can get close, they can't actually do it in the traditional "Hadoken" sense that every Street Fighter and their dog can do.
And Chronos might not have actually controlled the world, but are you seriously saying that Chronos would fail to notice the Sailor Senshi (and their massive media coverage) and react?
The basic chronology of Sailor Moon and Guyver are incompatible. This doens't mean they can't be crossed over. But it does require that you change certain base assumptions aboutbthe setting.
For instance, if Uranus (the advents that created Arkanphel) are actually a spawn of Chaos and were creating him and his zoanoid army to fight the Sailor Wars this could be acceptable. You then have to set back the Silver Millennium so that it occured before the Sailor Wars and thus before Arkanphel et al were created.
This requires major changes to the timeline of both series however. You can't just put them together raw.
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Epsilon