Picked up "outdoor" carpet from Home Depot. 3-feet-wide roll, sold at about $3.50/linear foot. Cheap and the backing is supposedly waterproof.
Making progress on the dog platform - about half way there now. Both storage locations (behind and under seats) are accessible as everything is on hinges. Still need to mount the front part (over the foot area) to the original seat mounts via L-shaped brackets, and mount the front "backing" to that. Will wrap up over the next few days.
