The inspiration was this actual Morris based Jaguar transporter:

Roland started with a playworn Dinky 956 Turntable Fire Engine:

...removing the turntable section of the model:

He then scratchbuilt the rear section in brass and plastic card:

All painted up and it's come together well:

Here's a second version Roland created with an alternative livery:

Roland has deliberately kept the model in the style of an old Dinky, but with different wheels and a bit more detailing it could easily be upgraded to a more accurate looking model.
You can read the full conversion here:
https://rolandward.net/bedford-ferrari- ... ad-code-3/