I ended up finding an article he had written for, um, I think it was Sail Magazine many moons ago. Then a very critical reply by a reader.
He is described as a bit of a Renaissance Man dabbling in not only yacht design, but many other things. It stated he lived in Margate, Australia, which is, I'm assuming, the Tasmanian Margate rather than my neighbouring Margate here in Qld.
At the end of the day, I think there's better out there and the vendor is dodge!! with a capital D!!! Tells me he will only supply part of a survey report until a deposit is paid; won't provide HIN and rego to do an encumbrance check. Sufficient red flags to say, "run away"
Thanks anyway for all your help. And so the search continues