really it all depends. If the car has an engine swap or is built to look like the JDM counterpart, sure, its fine to rebadge as JDM. I mean if you see an RSX with a lot of JDM stuff, its gonna look like the type-r.

I know a guy with a GTO who is rebadging as the Holden Monaro and building it like that. So I see nothing wrong with it if it is tastefully done.