The 1962 Excalibur RS Roadster in Photos

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The one-of-a-kind 1962 Excalibur RS Roadster crosses the auction block through Mecum on May 16.

Penned by designer Brooks Stevens around the middle of last century, the car didn't come to fruition until 2006.

Under the power-operated hood is a 5.7-liter GM V-8 crate engine.

The Excalibur RS Roadster comprises a steel-tube space-frame chassis built by Chuck Rahn, dressed in hand-formed aluminum bodywork.

The hood scoops are inspired from those on the Ford GT40 race car.

According to the lot description from Mecum Auctions, the car's power scissor doors come from a Lamborghini Murciélago.

Other features of the car include a polycarbonate windshield and a power-operated hood and decklid.

Though industrial designer Brooks Stevens was responsible for conceiving approximately 3,000 products during the course of his career, this piece of automotive exotica, while based on a concept he penned a few decades previously, was commissioned to be built by his friend, Bob Shaw, as a tribute.

At a time when the market seems to be in a state of transition between demand for classic automobiles from the middle of last century and growing interest in cars from the 1990s and up, the Excalibur RS Roadster combines elements of both.