From: Georgetown, Texas, USA
actually my source is David Ryan. Source title was an error (was at work and did not have it in front of my, title was from memory).
Actual title is: "The British Armies in World War Two, An Organisational History, Vol. 7, The New Zealand Army and The South African Army" by David Ryan, David Hughes and Steve Rothwell; published by Nafziger.
A most interesting booklet that covers even coastal artillery.
While you're ostensibly correct about the Australian Army, the New Zealand Army was somewhat different in this aspect, they generally did not shift battalions as happily around as the Aussies within their territorial brigades (there were some exceptions, but only on a very limited scale: 1st NZ Scottish and 1st Ruahine moved from 7th Brigade to the shortlived 15th Brigade in 1943; 6th Canterbury that moved to 16th Bde/Tonga in 1943 to relieve 34th Battalion had never been part of any brigade before). NZ stopped raising new infantry battalions in Sept 1942.
Sorry, my comments on David Ryan related to his web site.
I do believe there was somewhat more movement of battalions - the 30th for instance moved from the 8th the seed the 14th.
The upgrades of Cavalry units to light armour is interesting - the same thing happened to a few of the Australian Light Horse units. The Australian 2nd Cavalry was briefly redesignated 2nd Armoured (actually mixed) and some of the individual brigades acquired tanks. This also applies to the New Zealand Cavalry Brigades - one armoured Regiment (Battalion) and the rest motorized. I think the Australian armour was one tank squadron and two of armoured cars per Bde but the New Zealanders went for a full TOE armour regiment (mixed Valentines and Stuarts).
I am no longer involved with CHS but I think much of this would be a good idea for CHS. Not so enthusiastic about too many additional home defense units in New Zealand, as it would be very unlikely if they would ever come into action. I do have the armoured upgrades for Australian and New Zealand Cavalry units in my own scenario.
I am interested in the Nafziger book - have you ordered from him recently? Some of his stuff has proven a little weak in the past but I am impressed if David Ryan is involved.