The minimap textures are stored in /World/Minimaps/, iirc addons were forbidden from accessing files outside of /Interface in a recent patch, so you'll have to make a copy in the addons folder.
Texture files are separated into folders, prior to the C_Map overhaul the map folder names were exposed, but i don't think that is the case anymore, so you'll probably need to create a map of folder names to map ids.
Inside the map folders you'll find a mess of 256x256 texture fragments, you'll need to piece them together, just place them on a 64x64 grid as they are numbered, tile 32_32 will be the map center (it's also where the 0,0 world position is in-game).
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