THE super-rich could soon be able to buy the worlds most expensive personal boat - a floating version of billionaires playground Monaco. The 500ft long Streets of Monaco yacht is expected to cost 700million and features scaled-down versions of the states famous landmarks, including the Monte Carlo Casino and racetrack. It boasts a Hotel de Paris, Cafe de Paris, La Rascasse, the Loews Hotel and swimming pools and tennis courts. And those hoping for thrills can rest easy, with a Monaco Grand Prix-inspired go-kart track zooming through a tunnel complex running around the deck. The super-ship is the brainchild of Derbyshire-based Yacht Island Design and if built would transform the boat industry. Company director Rob McPherson said: It is basically a floating city. We wanted to show our capabilities and grab peoples attention - I hope its worked. The car circuit was the thing that sparked the whole thing off. The Monaco idea came from that. Its aimed at a very unique market and we are designing themed yachts. Everyone is going for the automotive-style designs at the moment but we wanted to do something a bit different. This sort of yacht could be for the individual but theres also a charter market that could be interested. The Sun