A TENACIOUS mechanic has converted a $400 rust bucket into America's best custom car. JF Launier, 39, spent 22,000 hours and $300,000 pimping out a 1964 Buick Riveria - even remortgaging his parents' house as well as his own to finance the project. But the risk paid off when the finished article - named Rivision - won the Ridler award for America’s most creative and innovative custom car at the 2014 Detroit Autorama. Its value has also jumped with Mr Launier estimating it to be worth at least $1