Hi, I know this post is a few years old but what you need to do is dump RomFS by right-clicking on the game file in Citra or Lime3DS. For 3D models, make your way to the dumped folder and using Ohana3DS [https://gbatemp.net/threads/wip-ohana3ds-tool.392576/] open files in the gfx folder. From there Ohana3DS will allow you to export the model, animations, and textures, you might neext to clean up the UV mapping but that should get you the near complete product to open in your 3D modelling software!
