I've probably got more in archives because like I said yesterday I have many that I didn't recognize as big things at the time. Even the rocking horse at Gumeracha I didn't think of as a big thing until I saw it on thr wikipedia page, and that thing is huge.
Here's the Big Buddha at Sellicks Hill south of Adelaide. It's a 18-metre-high granite statue of Buddha, on the site of the Nan Hai Pu Tuo Temple which, as far as I can tell, is still under construction as there is restricted access to the site.
The big blade, Mount Bryan, South Australia#58