At the risk of pouring cold water on this it seems the main point is being overlooked here.
The donor car was the Citroen GS which was one of the most aero and fuel efficient cars built for the time.
It seated 5 , carried 16 cu ft of luggage and bettered 38 MPG from the factory. It also had disc brakes and self leveling fully independent suspension all round.
Personally I would be looking at that.
Cheers , Pete.
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