The mini Monaco 'hyper yacht' design that even has its own grand prix

British yacht designers have produced plans for a floating replica of the billionaire's paradise of Monaco that is so big it may never become reality.

The 500ft-long Streets Of Monaco design - expected to cost up to £700million - features scaled-down versions of the state's famous landmarks, including the Monte Carlo racetrack.

It also boasts miniatures of the famed Monte Carlo Casino, Hotel de Paris, Cafe de Paris, La Rascasse, the Loews Hotel as well as swimming pools and tennis courts.

It even has a platform that holds smaller yachts in case prospective owners need something a little nippier to get around in.

The most mind-bending feature is the Monaco Grand Prix-inspired go-kart track complete with tunnel complex which runs around the deck.

But for the designers the centrepiece of the incredible ship is The Atrium, which links the upper and lower living areas.

The Atrium has seven guest suites which all include their own reception room, bathroom, dressing room, bedroom and balcony.

In total, Streets of Monaco' would be capable of housing 16 guests and 70 crew and would cost the opulent owner tens of millions to run each year.

And the multi-billionaire would get the benefit of the main apartment which is spread over three floors, sprawling an amazing 4,800 sq ft - the size of a luxury penthouse.

While only at a design stage, The Streets Of Monaco would likely exceed the £665 million price-tag rumoured to be paid by Roman Abramovich for his 'Eclipse' yacht to become the world's most expensive personal boat.

At 500ft, The Streets of Monaco is 25ft shorter than the Chelsea owner's super-yacht but Abramovich would undoubtedly be envious of the Monaco's fully functional kart circuit.

The Streets Of Monaco is the brainchild of fledgling Derbyshire-based Yacht Island Design.

Company director Rob McPherson said: 'The design theme called for a unique yacht that reflected the style and sophistication of the principality.

'We want to create a truly unique environment that could take the principality of Monaco to the ocean.'

Now that the design has been completed, the only question remaining for Yacht Island Design is whether they can find a billionaire with enough spare change to turn it into a reality.

Tennis stars Rafael Nadal and Roger Federer play match on floating court IN the Persian Gulf

When tennis legends Rafael Nadal and Roger Federer face each other, the last thing you want is for rain to stop play.

But in their latest clash, a flooded court was unavoidable - it took place on a floating platform on a lagoon in Qatar.

Federer of Spain took on his Swiss rival, the world No 1, on the specially made stage in Doha ahead of the Qatar Open, which marks the start of the tennis calendar.

They have 25 Grand Slam titles between them, though 29-year-old Federer, older by five years, has won 16 - the male record.

The Swiss star will be looking to bounce back from a string of Grand Slam defeats in 2010 while his biggest rival Nadal is hoping to resume the dominant form that saw him capture the French Open, Wimbledon and US Open titles.

Spectators can expect to see much of the pair in 2011, starting with the tournament held in Doha, the Qatari capital, which begins today.

Last year, Russian Nikolay Davydenko came from a set down to defeat Nadal 0-6, 7-6, 6-4. And the year before that, Great British hope Andy Murray took the crown.

A taste of the Nadal-Federer rivalry was also on display in Abu Dhabi on Saturday, when Nadal edged Federer 7-6, 7-6 to defend his title at the invitational World Tennis Championships.

Before leaving for Doha, Federer said he saw Abu Dhabi and Doha as a chance to try out new shots.

He added that he was looking forward to resuming his duel with Nadal that will get its first big test at the Australian Open where the Swiss player is the defending champion.

'It's a special Australian Open with me being the defending champion,' Federer said.

'Obviously the focus is going to be on the two of us. Tennis is really going to be exciting down in Australia.'

Nadal said he doesn't feel any pressure ahead of this year's Australian Open, even though a tournament victory there would make him the first man to win four major titles in a row since Rod Laver pulled off a calendar Grand Slam by claiming all four in 1969.

'It's not extra pressure, for me it's extra motivation,' said Nadal, who lost in the Doha final last year to Russian Nikolay Davydenko.

'The pressure is every day to play well and keep winning matches and I don't think (about) winning the Australian Open immediately,' Nadal said.

'You never know what's going to happen since it's going to be a very difficult tournament.'