Rear-door inserts handcrafted from a single block of American Walnut or American Cherry BY MARK MAYNARD Wood is an organic element that adds natural warmth in an inorganic mode of transportation — but not all wood is equal. The ultraluxury car segment has long been a purveyor of unique wood veneers for vehicle interiors. And the types of woods used by some makers, such as Rolls-Royce, are archived, catalogued and identified by the vehicle, make...