IIRC none of the Yarra ones was paddle. There is a booklet available on the Yarra ferries (I own a copy): one of the few marine titles stocked at Railfan Shop, and probably available at Hylands (if you can find the new premises).
I remember MV Jolly Roger: it looked top heavy, and had a reputation for sinking in mid cruise.
Peter may yet post to tell you how to find the regular Sunday cruises at Cairnlea (Deer Park). He hosted me as an onlooker one day. Surrey Hills has regular model operation (Canterbury Rd at Elgar Rd), but most models won't be paddle unless it is a theme day.
Roderick B Smith
Rail News Victoria Editor