I was looking at one of the old Corse kit launch magazine articles the other day, and I noticed that the floor section and roll cage was exactly the same as an Allora (square box floor, not 'L' shaped beam).
The rear chassis and front suspension was definitely 'Corse Strut' though.

I wondered how many kits were made like this, or was it just the one?

This is regarding the yellow demonstrator car, reg. UDN 683V