I think you're confusing this with Ascension which is a different server. Turtle was more like Classic WoW but with additional content that fits in as if the official expansions had never existed. So basically it's like Old School Runescape for WoW.
Turtle WoW also attempted to rebuild the entire game client from scratch in Unreal Engine, using Blizzard's art, textures and maps.
Turtle WoW also attempted to rebuild the entire game client from scratch in Unreal Engine, using Blizzard's art, textures and maps.