The elbowed antennae place it into Lucanidae, as you suspected.
This link is a good place to start. https://sites.google.com/site/insectsoftasmaniacoleoptera/suborder-polyphaga/lucanidae-stag-beetles/genus-lissotes
Agree with Lucanidae, but no IDeas about the genus, though...
http://bie.ala.org.au/species/urn:lsid:biodiversity.org.au:afd.taxon:2d624ea7-4c70-436a-899f-c4377c1122d4#tab_gallery
https://www.flickr.com/photos/22953763@N02/5347835957
http://flickrhivemind.net/Tags/australia,lucanidae/Interesting
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