This is a good place to start for modelling: https://forums.uberent.com/threads/reference-models-textures.48081/ You'll need this if using Blender: https://forums.uberent.com/threads/rel-blender-importer-exporter-for-papa-files-v0-5.47964/ There's also more guides about various modding topics here: https://forums.uberent.com/threads/pa-modding-reference-guides-applications-tools.48136/