I realized that the Cerberus was parked in Port Phillip Bay in Victoria as a breakwater however I did not know that a model of her had been made. Brigade Models of the UK have released a model of the Cerberus (actually, they did it on 3 May 2008). The link to it is Australian Cerberus class Monitor – VLI-180.
There is also a very good web-site as part of the campaign to save the Cerberus at HMVS Cerberus – Home Page. The Cerberus was, a vessel of the Royal Victorian Navy and is historically very significant. The vessel is the last remaining Ironclad monitor of her time and one of the first to have been built. She was certainly the first fighting vessel produced by Great Britain that was powered entirely from her engines, not having any sails.
I came across this model because my interest in Victorian Science Fiction Wargaming was rekindled, see Victorian Science Fiction.
The picture of the model is taken from the Brigade Models web-site.