Australia certainly did have many, and some have survived. They were used mainly for fishing; many river families survived the great depression by living aboard, and relying on fish and riverbank vegetable growing (also 'underground chicken', ie rabbits).
The APAM threads have concentrated mainly on survivors.
They also include many modern houseboats built to traditional styles, and a lot of these are in the workboat scale (11-13 m).
Use the Paddleducks search facility for:
Traditional: PS Roy, PS Viola, PS Ranger (all single deck),
Modern: PV Murrundi, PV Ronald Henry, PV Canally, PV Miralie, PV Matilda, PS Billy Tea, PV noname (in the Oscar W fleet), PV Gnat (not Gnatty), PV Sundowner (all single deck), SWPV Adventurous; there are more, but then the list moves up to longer single-deck ones, and boats with at least a wheelhouse forming a second deck.
Slightly larger: PS Enterprise (preserved by National Museum), PS Etona (a former mission boat, restored to original appearance after decades as a single-deck fishing boat).
Somewhere else in Paddleducks is a small mission paddlesteamer in India (try searching on Hooghly River).
I can't recall if we found a small on on Zambesi River; that one may have been screw.
Regards,
Roderick B Smith
Rail News Victoria Editor