In the 1970s, Thompson proposed to develop an all-terrain "World Car". After working at Ford for 8 to 10 hours, he went to a rented garage where he hand built a prototype. He built his own molds and did all the assembly work. The car was built with a hard top and an optional fabric top. It was constructed on a Renault chassis, and used Renault engine components, and braking systems. McKinley constructed everything else. The body was made using a unique thermoformed, high impact, laminated structural plastic called Royalex. The concept was based on several merits. One was the thought that once more people were driving vehicles, it would increase the need for the development of roads. This would result in the creation of new jobs and training. Although the Warrior was never put into production, it remains a testament to McKinley's drive, dedication and skill. If you travel to Sun City, AZ, you might catch a glimpse of McKinley driving the Warrior today.