So the British are going to have three Army Tank Brigades AND an Australian Armoured Division when all the reinforcements come in. Putting aside everything else, I just want to note, that even though I need to go and reread the TL to catch up on where they are organisation wise, before I go telling tales, but that is a dreadfully large number of tanks. Like brutally large.
Putting aside technical specifications (oh so dear to our hearts), we can be pretty sure that Allies are going to be able to keep up with extremely demanding logistical needs of hundreds of AFVs. Plus an entire Army. And it is going to run like a clock.
What do you think, how are the Japanese holding up? It is not that Allies do not have logistical problems, bottlenecks and other things that happen during a World War, but they pale in comparison to those Japanese are facing. Losses in shipping must be harsh, especially due to Allies putting up a fight and making the Japanese pay high price in merchant shipping.
And Japan pissed off USA, which still has a large and potent fleet which is your No.1 Objective, all the while RN gathers the fleet, shielded behind land based aviation, which probably dreams of IJN being that idiotic as to bring its carriers that close. And Australians are pumping out Beuforts, alongside Anglo-American reinforcements in both aircraft and formations.
I do look forward to seeing how the Pacific war develops further, especially WRT carrier clashes between USN and IJN. Considering better situation for the Allies then IOTL, USN may do better, because greater strength of RN (and other Allied Navies) draws away Japanese Warships and resources, while at the same time allowing USA to concentrate and use its ships elsewhere.
Great work.