Maps 

Open Street Maps

Google Maps

A plan of Mawson's amended 1912 design on flickr.

LCC maps is a good resource.  Zoom in to the park and then try 'Browse layer' then search for 'OS' or 'Aerial' and 'Add'. You can zoom in to Ingol Lodge and/or Bostock's Farm on the '1890s OS First Edition 2500' map or look at a 1940s aerial photo.