The concept used a bright metallic yellow color, honoring the 4CV's "butter pat" nickname.

[2] Styled by Benoît Jacob[3] under the direction of Patrick le Quément, Renault's vice president of corporate design at the time,[4] the Fiftie used a mid-engine/rear-wheel-drive layout, with its exterior styling drew heavily on its ancestor's — though with a two-door, mid-engine configuration[4] rather than the 4CV's four door, rear-engine/rear-drive layout.

The Fiftie was part of a trend toward retrospective designs, including the VW New Beetle, Mini Cooper and Fiat 500.

The Fiftie used an aluminum frame from the Renault Sport Spider[5] and a carbon fiber body.

Front styling recalled the horizontal chrome 'mustache bars' of the original 4CV, with the addition of distinctive apostrophe-shaped headlights.