This sounds to be a generic design (there is no entry for a boat with this name in Parsons 'Ships of the inland Rivers). Do you have a concept sketch or photo from the article heading which you could post?
There is a picture of another generic Australian design floating around somewhere else in Paddleducks.
I don't recall it being named Jennifer Anne, so it may be a different design. IIRC it had a deeper hull than the original would have had, to give the model stability.
Another member has created his own generic Australian one, and posted photos of it (use the search box on 'Ned Kelly).
Regards,
Roderick B Smith
Rail News Victoria Editor