Interior of the SSC Tuatara is consistent with its exterior features in a form-follows-function design.
This is the interior of the SSC Tuatara shown in this video (and photos below) released by Shelby Supercars.
Design on the inside of the Tuatara remains in the same sleek but functional language as on the exterior of the car. The interior features a digital instrument panel lit up by a Pico projector similar to that of a head-up display. The steering wheel is an oddly-shaped square with rounded corners. The center console also features a large screen and a red start button that turns on the engine.
Read more details in the statement below that came with the video and where SSC explains the ideas behind the design.