PK Designs, also trading as Car Concept Designs and later as Merlin Cofano Designs, built specialty kit cars from a shop in Petaluma, California. The company said in 2008 it had been designing and manufacturing kit cars for over two decades, working under a designer identified in later branding as Merlin Cofano. Its main model, the Merlin, was a two-seat coupe kit built on a donor Datsun 240Z, 260Z, or…