Clyde
The 405 DHC is best described as a 2+2 with the rear seats more suitable for children. The hoodframe is pivoted in the B post area so the rear seat is narrower than on the saloon to allow room for the hoodframe to fold down each side of the seat. The backrest is moved forward to give space for the hood to fold behind the seat. But the 406 is a bigger car and I think in this case you would be able to retain a rear seat which was large enough for adults. I think it is very unlikely indeed that you would find a 405 DHC hoodframe - and anyway I think dimensions would need to be altered to fit the 406. You would need to find a bare 405 hoodframe from a car currently being restored from which you could copy the design.
An intriguing prospect worth pursuing!
Alistair
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