There is a place in LA that advertises a service for doing 3D prototypes that might work for a one or two off piece.
http://www.hollywood3dprinting.com What I suspect is just like finding a place to do small runs of CAD/CAM or CNC work there would be a large up front setup fee.
I think the problem with doing a 3D repro of the seat panel is going to be size. I haven't kept up lately to see if anything other than the experimental units that are doing the 3D printed houses and automobile bodies are available now but most of the units I have read about can only handle something under 12 inches and most of them are a lot less than 12". I would be surprised if Office Depot has a machine capable of doing the long panel. Another question would be could the plastic material used in the regular machines stand up to interior heat if the car is left in the sun and what would the finish surface look like.
I am wondering if a silicone or urethane mold could be made of a good panel face. Spray that with Gelcoat and then apply cut fiberglass strands with some mat or fiber and metal reinforcement at the trouble spots. That approach should maintain some resemblance to the grainy texture of the original piece as well as allow the repro piece to be made thicker and maybe less prone to cracking. Gelcoat can be brushed or sprayed but finding an inexpensive chopper gun for the strands might be an issue.
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