Famous marque's experimental vehicle unveiled The Rolls-Royce is as much a part of Hong Kong's scenery as The Peak or the Bank of China building. Big, spacious and, most of all, expensive, no tycoon can get by without at least one in the driveway. But yesterday, the marque gave the city a glimpse of one model that even the most well-heeled Hongkongers are unlikely to get their mitts on - the Rolls-Royce 100EX experimental vehicle. A one-off test bed for the latest ideas the carmaker's design team could create, the 2.5 tonne 100EX was built to coincide with the luxury carmaker's centenary celebrations this year. Rolls-Royce Motor Cars Asia Pacific regional director Colin Kelly said it was unlikely the soft-top car would be sold, despite offers of more than US$6 million from a couple of the many people it has wooed during its six-month world tour. But he did reveal that a production car based on the 100EX would soon be available. 'We have a history of drop-top cabriolets,' Mr Kelly said, adding the new car, to be based on last year's popular Phantom model, would be a two-door four-seater convertible packing a 6.75 litre V12. For the 100EX project, the design team was given a fairly straightforward set of instructions from chief designer Ian Cameron: 'Under the term experimental, anything is allowed.' And it was. The engine, for instance, is a one-off 700HP, 9-litre V16, while the one-piece bonnet that covers it began life as a single lump of aluminium weighing in at two tonnes. From there, it was gradually ground down to its final shape and now weighs a mere 17kg. The fact the aluminium is unfinished means it loses its lustre quickly, so the vehicle's custodian, Wolfgang Sauer, has a fairly busy time keeping it looking shiny. Not that he minds. As one of the BMW Group's chief concept car testers, he is one of the few people in the world likely ever to get a drive of the 100EX, or any of the other vehicles that pour forth from the minds of the marque's designers. 'It's a busy job,' he said. 'I like this job, getting to drive the best cars in the world. We do not test this one though.'