Snale — you were right, and I'm sorry it took this long. The .blend was pointing at PSD files that never made it into the download, so nothing had textures.
It's fixed now. Textures are packed inside the .blend, so it opens with colors straight away, and the GLBs carry their textures as well. There was an earlier update that still had issues — this one is the final pass.
@kayborowski — thanks for the ping.