I found an interesting article
The ‘seeds of Holden’s demise’. Where it all went wrong for GMH I rather liked:
Hartnett thought building the fenders into the side of the car in a single panel would make the car more economical to produce but GM passed on Hartnett’s design and went instead with a rejected GM prototype.
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“I’m going to argue that the seeds of Holden’s demise were sown right from the start, that Holden was destined to be behind the times for decades”, Loffler says..........
I agree. No car company could possibly survive making separate front and back mudguards. It would not only be very old-fashioned but uneconomical