"That is not to say that Benin kingdom doesn't have its appeal, it's just that the discussion on this site will be much, much less civil."
Well... I've seen people popping into related threads to make comments about how Cortez 'brought civilisation to Mexico' already, so... I'm kind of in that territory regardless.
If I had mixed feelings about a historically-accurate Benin citybuilder it would be about the relative paucity of easily accessible reference materials on the topic (google image search for buildings & architecture doesn't turn up nearly the same level of results compared with nahua/aztec search terms,) combined with my general sense that afrocentrist scholars are prone to... ah... overplaying their hand when it comes to the accomplishments of pre-colonial sub-saharan cultures. What's there seems promising, but digging up sources I could both trust and defend might take professional training.
If I tackled a polynesian or celtic setting there would probably be a large dose of fantasy involved. (It's hard to get a proper citybuilder out of it otherwise, though I suppose Nan Madol offers certain possibilities. Open to correction, naturally.)