Here is Frank's Turbo, is that what you were looking for?
http://rennsport.ca/E_membership/adsinfo/1994_Porsche-Intermeccanica_RS.pdf
I found that car while trying to dig up some info on my current car. There is not a lot of info out there on Older IM -GS, RS and Turbo cars with the P car Sixers but here is where it was noted that the construction process evolved over the years:
Around 1979 and '80 a design and tooling was developed for the construction of a massive neo-classic sedan with a 129 inch wheelbase on the Checker (of taxi cab fame) chassis. During this time, however, the California economy experienced a downturn and the market for such a vehicle collapsed. A more succesful project for 1980 was the design for a soft-top conversion kit for the Ford Mustang being sold through Ford dealers.
A visit to Vancouver, B.C. was paid in 1981, foreshadowing a move there the following year. Before this took place Frank developed the glassfibre-bodied Roadster RS, a replica of the 1959 Porsche Convertible 'D' (D for Drautz), based again on a VW Beetle pan.
So, in 1982 Intermeccanica International Inc. is born in Vancouver and the Roadster RS goes into production. Quite a bit of these were made and they were mostly sold to Japanese and U.S. customers before some structural changes were made to the RS, including the replacement of the VW pan with a newly developed tubular chassis, arguably making the car an improvement over the Porsche itself.
the Roadster 356 (or RS)(I.I.)
Later on the RS was further refined with the addition of fender flares, a modified front, a hardtop, a new steel tubular chassis and the use of the mechanicals of the 6-cylinder Porsche 911.
Henry Reisner, Frank's eldest son, has learned the trade from his Father and has been successfully running the business for some time now.
the Roadster Turbo
Currently Intermeccanica International offers a choice of the following high-quality hand-built vehicles: The Roadster 356 (RS), the very aesthetically authentic replica of the 1959 Porsche 356 A Convertible D, and the Roadster Turbo, which looks like a mixture of Porsche 356 and modern 911.
Source:
http://www.team.net/www/ktud/intermeccanica_history.html