Actually Battlefield Designs sell a basic timber cottage along with a small shearing shed in MDF. Nic often stocks them in the shop. There’s also a smallish house in there that with some work and some brick card would make a serviceable small rural school. Let’s face it, all you need for most towns in the Wimmera is a pub, a couple of shops, a scattering of houses, the inevitable grain silo and maybe a church and a small school.
Agreed about the Perry plastic house, just replace the roof with a tin one and it’s good to go, replace the windows with sash type and it’s even better. The Perry store works pretty much perfectly and with a bit of work the church wouldn’t look out of place. Quite a few of the various MDF Wild West ranges have useful bits n bobs.
IIRC some of the railway stores make Australian windmills as well as a range of rural buildings, pubs, stations, railway houses etc. Mostly HO but I seem to recall someone did something in O. Check out the catalogues for Branchline and Trainworld in Brighton.