Remember the C1 Corvette-inspired Songsan Motors SS Dolphin from a last year? Well, if these images are any indication, it is about to get a four-door sedan variant.

The SS Dolphin was unveiled at last year’s Beijing Auto Show and is actually based around the BYD Qin Pro Sedan. It will also be built by BYD and these patent images preview the forthcoming four-door model.

It’s not yet known what this model will be called but it retains a near-identical design to the two-door. The wheelbase doesn’t appear to have changed and instead, the cabin has been pushed closer to the front axle and the front doors have been shrunk, allowing for a small set of rear doors to be fitted. The front and rear fascias of the four-door model appear almost identical to the two-door, although the headlights and taillights have been slightly updated.

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These patents also depict it with black front and rear bumper add-ons whereas the two-door has chrome bumpers, although we should wait for the production model as that might be just for the patent sketches.

One particularly interesting image shows the car from directly above and splits in the roof might suggest that it could be removed in four individual parts, transforming the car into a four-door, four-seat Targa (though, once again, we can’t be certain until we see the production model).

In all likelihood, the four-door model will have the same powertrain as the two-door. That will mean a turbocharged 1.5-liter that works alongside an electric motor and a 16 kWh battery pack. The convertible SS Dolphin two-door can travel up to 62 miles (100 km) on electric power and a similar figure can be expected with the sedan.