The Jackson Sportster originated in Durban, South Africa, when Leonard Jackson, an engineer, and his teenage son Jeffrey developed an interest in Minis after watching one outperform larger saloon cars at a speedway race in 1968. Father and son began rebuilding and modifying Minis together, and by 1970 had mounted a Mini 1100 engine ahead of a bucket seat with the idea of building a mid-engined sports car. By 1974…