In future versions you could try padding between the wood and carpet. Charlie can sink his nails into. My lab rides on the platform/storage drawers in the back. The rear seats are long gone. For my platform I used interlocking foam squares. Cheap and easily replaced. Nice video!
Let me know how it goes! I do recommend putting a thin rubber mat on top so they can grip the platform and not slide around if you're using it while driving.
