Registering an M3W in Oz should not be impossible by any means. There are a good few homebuilt or small volume production trikes on the road, mainly they are motorcycle based but there are some that use VW Beatle engine and gearbox, a custom built frame and a motorcycle front end. I have only ever seen one Morgan like trike. It was using a Honda engine but I believe it has now had a Guzzi engine fitted.

Peter

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