it would probably be better to split them into Zone plugins or level range plugins instead of Continent
Alliance or Horde
Eastern Kingdoms -> Elwynn Forest -> Download
Kalimdor -> Durotar -> Download
would also probably be best to have a Core Addon (QuestSpeak?) and in that core addon you could have each factions start zone quests (Valley of Trials, Northshire etc) and make that available on the mod sites then make the plugins available on your website.
I'd really love to see a proof of concept.
perhaps
Boss Mod: TTS might help get started.