The Rolls-Royce Cullinan isn't too far away from an official debut, but the luxury car maker isn't finished testing the new car yet.

These latest spy shots catch the brand's boxy SUV wearing snow chains during cold-weather evaluations. Rolls-Royce also has a Range Rover for benchmarking duty.

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The Cullinan looks imposing, even with camouflage covering the body. The model features a tall bonnet with a heavily chiseled appearance. Rectangular headlights add to the angular aesthetic. The boxy styling is even more evident in profile where there is a high roof for the large passenger compartment. The rear doors will create a wide opening for making a grand entrance to any event.

Inside, spy shots show that the Cullinan appears to share elements with the Phantom. They seem to have the same cabin layout with a large infotainment screen dominating the dashboard. Buyers will be able to choose from a practically infinite variety of choices for the upholstery and trim.

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Gallery: 2018 Rolls-Royce Cullinan spy photos inside and out

The Cullinan will have the same underpinnings as the Phantom, and it'll use the limousine's twin-turbo 6.75-litre V12. The SUV will get an all-wheel-drive setup but it's likely that it won't be capable of hardcore off-road duty. This car will be more for cruising in sumptuous style rather than rock crawling or bashing over the dunes.

Rolls-Royce doesn't yet have a date for the Cullinan's public premiere, but current speculation puts the reveal in late summer. However, the company reportedly plans to show the SUV behind closed doors to gather orders from its wealthy clients. Once it hits the road, the luxury model would compete against the Range Rover SV Autobiography and the Bentley Bentayga.

Gallery: Rolls-Royce Cullinan spotted testing with Range Rover