I don't know how many Terrapins were built worldwide, but these are ones I know of in NZ

1: Mk1. Kevin Ingram from 1971, initially as KBI Terrapin (won 1975 and 1977 Hillclimb Gold Stars, third 1976), Lyn Hatton 1978-79, Wayne Sendall (second in 1980 Hillclimb Gold Star), Ross Cameron 1982-85;sold to Steve Marks, but later bought back again
2: Mk1 built by Jon Warring 1971 - second in 1973 Hillclimb Gold Star, Daryl Seymour second in 1979 Gold Star, third 1977. Retains ownership
3: Mk1 built c1971 by Robert Stephenson of Dannevirke; competed in southern NI events as the Loumac. Believed still owned by Stephenson
4: Owned by Lindsay McCutcheon later 1980s - ex-Stephenson?
5: Mk1 completed 1990s in Whangarei and bought a few years ago by Graeme Farr of Wellington. Is this the car Gray Richards now has?
6: Mk1 built for historic racing by Stu Borland of Dunedin c2000
7: later version built in late 1970s or early 1980s originally with Saab engine and one-off bodywork reminiscent of a contemporary F3 car. Imported by Mike Ripper who fitted a Renault Gordini engine. Later (still?) owned by Rodney Atchinson.
8: Sports version. Bruce Wells 1985, later to Russ Cunningham and then John van Rijn