Finally had the chance to read the pdf, thanks for posting the link Abe.
The conversion of the cruiser HMAS Hobart was interesting, they would have been looking at Sea Slug but Tartar would have been much easier and more effective to fit, either Mk11 or Mk13 launcher(s) replacing B, C, or B and C turrets with two, three or four directors and a comprehensive radar update, Type 984 may even have fit. Makes sense that this option was never seriously considered, she was a single ship, she was old and had seen hard war service , with her bow being blown off by a torpedo, but then again being a prewar build she may well have been fit for service into the 70s or even the 80s its just a question of whether it would have been worth it.
If however the RAN had been permitted to take up the UKs offer of a CVL, two Tiger Class cruisers (think Superb and Swiftsure rather than Tiger, Lion and Blake) and six destroyers during the war; cruiser conversions would have been an entirely different matter. Hobart could have been the prototype with the two Tigers following with more mature fits, sticking with Tartar as it was proven suitable for conversions and had less impact on the platforms than Terrier, Sea Slug or Talos. These three ships would have filled the RANs air defence requirement while also covering the anti surface role with their remaining 6" guns, maybe look at the Mk 26 as per the RN Tigers for the upgrade to the later two ships. They would have brought the RAN into the missile age by the mid 60s, kept the ship yards busy and filled the gap pending the design, build and delivery of the RAN Counties as replacements for the Darings during the late 60's aearly 70's.
I always thought it was a huge pity that the government did not take up the offer for the RAN to man a CVL, 2 cruisers and 6 destroyers. Later when the government finally decided that it was a good idea after all and agreed to the proposal the ships were no longer available on loan and would have had to be purchased outright so that was the end of the matter. In fairness there were limitations with the RAN manning of RN vessels. The
N and
Q class destroyers remained under the operational control of the Admiralty and so were unable to join the RAN cruisers and
Tribal class destroyers in the SW Pacific, though they were assigned to the British Pacific Fleet when it was formed late in the war. Had the offer been accepted when it was made I believe it is likely that Australia could have purchased them at a good price after the war. Navy recognised the need for a couple of modern cruisers to support its carrier force but the age of the existing cruisers and the lack of funding to replace them saw the demise of the big gun cruiser shortly after the war with only one in commission as a training ship in the early 1950s.
Hobart was to have replaced
Australia as training ship when its modernisation was complete but the reduction to only 1 instead of 2 operational carriers resulted in the CVL
Sydney being able to fullfill the training requirement.
In April, 1945, recognising the need for a viable local naval construction program Cabinet approved in principle the construction of 12 destroyers over a period of about 10 years. 6 destroyers were ordered shortly after the war and these were followed in 1950 with an order for 6 fast ASW frigates (similar in size to WW2 destroyers). The first 2 destroyers (Battle class) were built in reasonable time so a good start was made. Alas, the rot then set in. Construction of the next 4 (Daring class) proceeded at a snail's pace and 1 was cancelled. Likewise 2 of the Type 12 frigates were cancelled and none were commissioned until the 1960s.
Officially the navy stated that cruisers were no longer required as the role could be performed by the Daring class destroyers but I am sure that if it had received 2 modern cruisers in 1945 they would have remained as escorts for the carrier force well into the 1960s. I agree that they would have been good candidates for Seaslug or Tartar.
Almost 70 years later and we still seem to have a boom/bust naval construction program. Let us hope that future construction is well planned and staggered in such a way that there is a long term sustainable building program that offers ongoing certainty to the skilled workforce that will be required.