You can see what CMC did with the 359 after all they had the centre section from their old Speedster design. Only the doors on the 359 are interchangeable with the other CMC Speedsters. The whole car is longer and has a wider track to look like the real 959 Speedsters and they share the original wheel base of the 959. The Porsche 911 Speedster copied the old 356 Speedster windshield design. Becker used the 911 Speedster windshield design to create their real 959 Speedster. Of course CMC already had the old style 356 Speedster windshield design that they carried over to the 359 Speedster. later CMC even produced 959 Body Kits to convert Porsche 911's to make them look like 959s!
TOP PIC: CMC 359 Speedster (959 Speedster replica).
BOTTOM PIC: Becker 959 Speedster (959 based Speedster):