Cadillac has unveiled the Cadillac Sollei Concept – a tantalizing preview of what future Cadillac buyers may be able to commission from the brand’s new custom coachbuilding division.

The front of the Cadillac Sollei Concept is nearly identical to that of Celestiq, upon which it’s based, with a sweeping “black crystal” grille, embedded LED lighting, and sleek lighting units. Moving back, the Cadillac Sollei Concept features a billet aluminum windshield frame with a unique “Aurora” tint, which is also used on other parts of the vehicle. Being a two-door car, the Cadillac Sollei Concept features massive side doors that swing open nearly 90 degrees to help with ingress to the swanky four-seat interior. These doors are, of course, fully power operated, opening and closing with the touch of a button.

The rear of the Cadillac Sollei Concept is where the real difference between this and the Celestiq becomes apparent, with a completely re-imaged tail that features a long, thin light bar with the Cadillac crest in the middle. This new tail is certainly less avant-garde than that on the Celestiq while still being distinctive. More blade-like lighting can be found lower in the bumper, similar to that in the Celestiq.

The Cadillac Sollei Concept is finished in Manila Cream, a color first used by Cadillac in 1957, and features a folding fabric roof in Daybreak metallic. Large wheels in a bright chrome finish round out the Sollei’s unique exterior design features.

Inside, the sky’s the limit as the Cadillac Sollei Concept takes the extreme luxury of the Celestiq and pushes it even higher into the luxury stratosphere with a sun-theme interior design. Featuring the same 55-inch pillar-to-pillar dash display as the Celestiq, the Sollei Concept builds upon this base with the use of five different hand-cut wood veneers and fine Nappa leather. These veneers can be found on the doors, center console, and even the backs of the seats, where they form a stunning sunburst pattern, an obvious nod to the vehicle’s name (“sollei” means “sun” in French).

A full-length center console stretches from the front of the cabin to the back, with rear-seat passengers getting their own touchscreen control for things like climate and seats. Other rear seat features include a fully integrated beverage chiller with a power glass door that houses a custom-made decanter and glasses with a starburst pattern.

The Cadillac Sollei Concept’s seats feature fine Nappa leather with a subtle pink iridescent pigment that changes color depending on the angle from which you view them, intended to recall the colors of a sunrise. New materials abound in the Sollei’s interior, with “Bask” carpeting, a boucle fabric that matches the color of the roof. A new eco-friendly material, “Fine Mycelium,” also makes its debut in the Sollei, a totally renewable material derived from the root structure of mushrooms. Fine Mycelium can be found on the door pockets and charging mats, with Cadillac hoping to expand the use of this material to other products in the future.

Oh, but wait, there’s more. 3D-printed bird calls for North American birds, such as the goldfinch, are also included, as is a leather-bound journal with hand-painted bird illustrations. This leather journal is, of course, made from leather that matches the Sollei’s interior. Would you expect anything less?

No pricing information was shared for the Cadillac Sollei Concept. However, with the Celestiq sedan starting north of $300k, it’s safe to assume the production of the Cadillac Sollei Concept will be even more expensive than that.