Final Fantasy and WoW are extremely different.
long story short, the emulator code writers way back when needed basically 3 things. only 1 is available through datamining- object lists, shit in the world you interact with. the major second part was some dork in packaging left debug on (or so i heard for all i know it's lies but it got the point across), what was provided was the table structures and further insight into how the server to player worked. thus slowly they took the time.. ripped open WoW client files and mashed them together with the info they got for the servers til something worked.
coincidences, time, tears, headaches, migraines, marriages lost, children killed, and even a small island nation was nuked before something viable came out.
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best chance = *cough*
FF14 private server - Google Search *cough*
looks like the island got nuked. find some forums, google up mehbe how to build; or ask the forum people yourself.
*nothing i said is remotely but possibly and or plausibly distinctly true, salt... take a grain and understand the pain.