The method of obtaining resources refers to the SaschaWillems/Vulkan repository
Binary assets (models, textures, etc.) are not stored in this repository and need to be downloaded manually.
Run the download_assets.py python script which will download the asset pack and unpacks it into the appropriate folder.
Download the asset pack from https://vulkan.gpuinfo.org/downloads/vulkan_asset_pack_gltf.zip and extract it in the data directory.