Hb- (2020-02-13 23:15:00+00:00): Free and non-free sources offer information about the fence, its surroundings and other trivia.  And I used them all.

The copyrighted book about "The Easter Bunny and the Rabbit Fence" is one of them, see https://books.google.de/books?id=PMz3CJdd-e0C.  This made me feel bad.  My work might still be incomplete because the mapped fence does not run through Goombi as described in the book.  A dilemma.

I hope it is OK for the DWG that all (even copyrighted and technically copyprotected) sources can be used to form a personal idea how such a fence needs to be built and maintained and might look like.  For example this non-free https://www.facebook.com/DDMRB/posts/1949264168460782 leads to Karara.  As a search result for "rabbit fence" in JOSM/Nominatim I found two roads https://www.openstreetmap.org/way/333041274 (plus w765928303) which gave an idea where the fence might be.

The rabbit fence is accompanied by two maintenance tracks (I got this idea from several photos from Facebook).  It has also thither meshes than cattle or sheep fences. Therefore it looks darker.  And a lot of its corners and gate posts are stabilized with metal frames, see here https://www.mapillary.com/app/?focus=photo&pKey=TbHwfNUCAJMdLDqCqcnkvQ.  These features makes the rabbit fence distinguishable from other fences in the aerials.  

Wikipedia has a list of the eight councils financing the fence.  Screening the aerials in south wester direction of the villages of these LGAs and their predecessors brought me a big step further.  

Three sections of the fence have already been mapped by others, see https://www.openstreetmap.org/way/738488848, w658389012 and w658389016.

Using the hopefully free image https://www.mapillary.com/app/?focus=photo&pKey=ce_D9g3dadKv6KeF78wP9A and the next one gave the idea how the construction looks when the rabbit barrier needs to cross a road.  This was a big help for finding this node https://www.openstreetmap.org/node/7205852660 near Chinchilla. 

Some "educated guesses" were made.  For example the node https://www.openstreetmap.org/node/7205852638 and its neighbours were mapped to the idea that the fence would no run through the sewage handling area.  

Another guess was that the fence line goes up further North at this node https://www.openstreetmap.org/node/7205864196.  At first the fence going westwards looked better.  And I did a few nodes on that route.  But then the misses came: No grids, no gates and no maintenance tracks aside.  So I guessed that this structure https://www.openstreetmap.org/way/771871452 needs to be a cattle grid 
to keep on going.

The final guess to be described here is that this part https://www.openstreetmap.org/way/771871458 was only formerly the rabbit fence. It is not in use any more because the coal mine expanded.  Bing shows nothing on the new route, but the newer Esri images do show the fence.

To conclude:  While still having some guesses I was convinced that the data taken from allowed sources is good enough to be seen as "reliable" and therefore I uploaded.

1) Please let me know if the statement above is not enough to answer the first question.

2) For the guesses I made one factor was which councils pay for the fence.  This information comes from the DDMRB.  I consider this information as free.

In future someone might notice this gate https://www.openstreetmap.org/node/7209079924. It has an URL tagged to an article which describes it and shows it.  No data from that article was uploaded to OSM, only the URL directing to it.  Please feel free to give some thoughts about this.