I discovered this long dormant discussion earlier today. Since I know about two recently published free Ferret models, I tried to sent Kevin a PM. This did not work.
Herewith the links:
The first is a very basic Mk.1 in 1/87 scale that can be found at -
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The second is a more substantial model of a Mk.2 in 1/35 scale. You can download it from -
AB Papercraft: 1/35 Ferret Armoured Car Papermodel
Hope this is of some assistance.
Sepp