To do such works (legally) you need to submit a DA (development application) to the local Council and get it approved first.
Most Councils publish basic details of these (DAs) on their websites. - it it a legislative requirement I think. They (Councils) then let interested people (e.g. neighbours etc) go into the Council and view the documents of any development application they like for free as a public service.
Wynarka seems to be part of a small Council called 'The District Council of Karoonda East Murray' which I haven't heard of before however they do publish basic DA info at
http://www.dckem.sa.gov.au/page.aspx?u=187
Specifically
http://www.dckem.sa.gov.au/webdata/resources/files/internet register 2015.pdf (2015) and
http://www.dckem.sa.gov.au/webdata/resources/files/internet register 2014.pdf (2014).
Being such a small Council there is not many applications at all, and few of them are actually in Wynarka. What these tables may not show is if someone have put in an application and it hasn't been approved yet - there seems to be some entries that suggest as soon as an application is lodged the Council updates this register (prior to the DA actually being approved) although I wouldn't assume it to be comprehensive for DAs until after the DA has infact been approved.
The tables do show where (e..g Wynarka, Karoonda, somewhere else) work was proposed, what work (e.g. carport, new house etc) and who the applicant was (i.e. generally the owner) for each DA.
What I also found of interest while looking at the Council website was under the menu District Information => Centenary 2011 there is a link to a page called "Centenary Quilt" (
http://www.dckem.sa.gov.au/page.aspx?u=284) about a quilt presumably made in or around 2011 (to mark the Councils 100 year event?). Details quoted below.
While the quilt is nothing like the one linked to in the media I find it interesting there is a quilting group active within the local community (Karoonda is 10 minutes from Wynarka according to Google) - if the quilt found in the suitcase was made local then this groups members perhaps know details about it (or even made it).
While the quilt shown on the Council website is more intricate I was surpised it took over 3000 hours to make, how long do people think it would have taken someone to make the quilt found in the suitcase?