Well, good news and bad news:
Bad news is I can't find a decent S2000 drivetrain. Only found one complete set but it was overpriced.
But the good news is that I could snag a N/A 13b with bridge ported rotor housings and a RX-7 tranny on it. I'll probably use a Miata rear end. Finally my dad is somewhat happy. He works at Mazda which main factory is here in Hiroshima.
Now I'll try to sqeeze the rotary into the Civic. I mean if that thing fits a Miata, it can fit this one, right?