Guess the vintage build...

[Hibernaculum]

...from decals only ...

And a clue:

This model was never given a normal photo profile in any Tamiya Guide Book.

[Baddon]

look very like the seatbelts from the SuperShot,

 

BUT it had a standard paring photo in the guide books (BUT the car was from the rear in the body off photo-- normally they are both facing forward)

is that what you mean???

[Hibernaculum]

Super Shot - correct   

Actually it looks like some copies of the 1987 Guide Book did feature the Super Shot, while others did not show it - how strange! I never noticed this before. What other variances are there in the catalogues or Guide books?

[KEV THE REV]

I have a guide book with the Bigwig on the cover that does feature the Super Shot