Roger,
That was the car that came up for sale in Hunterville a few years back, it was less motor and interior, the grill & screen was missing.
I think I heard Ferris used Humber 80 rear windows for the front srceen.
The car ended up in Nelson, I rung the guy to try and buy it but he wanted to rebuild it.
I have some pics of it too.
Its a nice shape and as you say was a shorter wheelbase.