http:/nla.gov.au/nla.map-rm2741-426-sd-cd
Comparing the map with a map of today I would say today's Potts Rd continued through what is called Centre Rd today and the Potts property was on the SW corner of today's Centre Rd and North Rd.
Alternative: Comparing the map with Google maps The Potts property looks as though it is bounded in the north by present day Robinsons Rd, at the east by a line drawn south from Donald Rd, at west by a line drawn south from Bergmen Rd and the south boundary being Larnach Rd (partial because of the corner block owned by Cross). Peter Woods