I don't know about Scottsdale or Phoenix area but... find the hot-rodders. They are constantly having one off customs created so if they have a shop they all go to you can bet it's probably top notch. Door panels and carpet kits would be a walk in the park.
Here's a bunch of hot rod shops listed in Phoenix. One's even an upholstery shop:
Arizona Street Rod Shop Inc
2544 West McDowell Road, Phoenix, AZ 85009
(602) 233-2178
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Hot Rods by Dean
3334 West Wilshire Drive Suite 41, Phoenix, AZ 85009
(602) 455-9775
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Lance Troupe Custom Street Rod Interior
3334 West Wilshire Drive Suite 40, Phoenix, AZ 85009
(602) 272-9906
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Palmer Motor Cars
2544 West McDowell Road, Phoenix, AZ 85009
(602) 233-2178
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Premier Frame & Body
3029 West Clarendon Avenue, Phoenix, AZ 85017
(602) 248-0812
Hope that helps...