The company relocated to Santa Ana, California, in 1975 and started to build replica cars, such as the Porsche 356 Speedster in 1976 and Checker Taxi in 1979.

Kits consisted of dual throat carburetors, intake manifolds, high-performance cams and oil filters.

A full line of free-flow exhaust systems was developed for 50 or more European cars in cooperation with an Italian tube company.

During 1961–1963, the Apollo GT body was developed by Intermeccanica for International Motor Cars, a company based in Oakland, California.

[citation needed] Also, a Mustang station wagon prototype was built for some J. Walter Thompson advertising agency partners.

In 1966, a new project was started with Jack Griffith of Long Island, New York, for a larger production all steel car with more financing.

The Cumberford designs were finished and refined by Franco Scaglione and a Griffith was shown with a Plymouth 4.5 L V8 engine at the 1966 New York Motor Show.

A new customer, Steve Wilder, decided to take over the project, called the cars Omega and had them assembled by Holman and Moody in North Carolina.

In cooperation with an Italian bank, Credito Italiano, Intermeccanica found a distributor in Genser Forman of New Jersey, and finally, production and sales reached the 100 to 120 cars per year level.

For the 1969 Turin Automobile Show, a modified Italia, which conformed to Italian requirements, and added a few features such as a rear movable airfoil, was built.

During 1976–1979, Automobili Intermeccanica was formed in partnership between Reisner and Tony Baumgartner in Santa Ana, California, to build Speedsters.

Baumgartner bought out Reisner's 50% share of Automobili Intermeccanica and later sold the Speedster project and equipment to Classic Motor Carriages in Florida.

During 1979–1980, tooling was developed by Reisner for the construction of a neo-classic based on the Checker chassis, with lines inspired by the Mercedes Erdmann Rossi model and the Duesenberg.

When the economy in California took a downturn and the market for this kind of car collapsed, the partnership could not come up with the financing required.

In 1981, Reisner developed a Roadster RS model based on the 1959 Porsche 356 Convertible "D" and made full tooling for this car.

During 1995–1996, A new project, a replica of a "Volkswagen Kübelwagen", a Porsche-designed VW jeep used in World War II, was undertaken and production was initiated.

Frank's son Henry Reisner, who had worked at Intermeccanica part-time during high school and university, and full-time since took over as president.

In 2015, Henry Reisner co-founded ElectraMeccanica in Vancouver, British Columbia to start producing zero-emission electric commuter cars.