After the original Giocattolo Group B of the 1980s, Paul Halstead continued under the HAL name with a series of later Australian specialty-car projects. The first was the HAL Monaro, a heavily reworked Holden Monaro shown in 2009. Built as a HAL design study, it used extensively revised bodywork and a 427-cubic-inch Corvette V8. HAL then shifted to a far more ambitious supercar program centered on a bespoke W16 powertrain created by coupling two…