Perhaps the Black Omen is Norstein Bekkler's warehouse.
HAHAHAHAHA! XD Perfect, I like it! (Of course I know you're joking. And it's not a bad joke, either!)
lavos who had probably been studying the earth in his burrow for millions of years, knew that when he was to erupt he would be facing tanks etc.
Y'know something? We never see anyone ELSE but Crono & Co trying to fight off Lavos in 1999AD. We don't see any side scenes of military taking action or anything.
Given this information, perhaps, by 1999AD, world peace had already been established, and the world had done away with military organizations and equipment?
Or perhaps, people were simply too distracted to actually notice that "the demon turtle king of Hades" (a joking reference to Lavos) had arisen?
I mean, after erupting from the surface of the planet, Lavos pauses just long enough before his bombing to be attacked by other forces.
...
Yeah, getting back in topic, those projections were either clones or holograms.
And they could've been constructed to fight back Crono & Co, or they could've been created simply for study.
My money's on clones though, since Lavos takes DNA from the Earth, he wouldn't need to make clones to study the original thing.