I gather the circuit changed a lot over time, here are three variations.
1954 the Initial NZ Championship Road Race, Easter Monday April 1954.
Attachment 32257
Start / Finish on Fryatt St, left into Halsey, right into Jutland left Wickliffe over the bridge onto Ward then kink into Burns left into Willis then right onto Fish left into Rattray and to the Start Finish.
1961 Festival Road Races Saturday January 28th 1961. a very different course.
Attachment 32258
Not much detail just names for the corners from the start ascent to the kink then descent to the Glen - hairpin, then curve around to kink at Service Station another kink at Kensington School the Railway to a sharp left at Tramshed corner, back to Start / Finish
1965 The Final Road Races - prior to the Revival meeting in 1984 from Scott Thomson's book " Racing Round the Houses "
Attachment 32259
A better map the course runs around the Railway Yards.
Here is a description of the course from Scott's book.
1965
Attachment 32262
Hope this is some use ;, and good to put the information here on the thread.