The cabriolet version of the chunky Mercedes G-Class off-roader was officially buried 10 years ago, but now a luxury custom car maker has revived the model for a cool $1.3 million. Elite versions of the G wagon have long been coveted by deep-pocketed fans, yet most of the tricked-out off-roaders are bargains compared to the car from Dubai-based company Refined Marques. Based on the Mercedes-AMG G63 Cabrio, the car gets a shortened wheelbase and front and rear doors which open in opposite directions. Behind the C-pillar, the roof structure has been removed and a sloping end in the style of the …