I've been reading about the progress of the Mogami-class FFM build - the 12 ships of the "Batch 1" FFM design for the JMSDF are currently approaching the end of their construction run. It appears the first 6 ships were completed without the installation of their 16-cell Mk-41 VLS, which is to be fitted later, while the remaining 6 ships are being completed with the 16-cell Mk-41 VLS.
The 12 ships of the Batch 1 Mogami-class will be followed by a class of 12 Batch 2 improved Mogami-class FFMs for the JMSDF, which will be somewhat larger than the Batch 1s (Batch 2 standard displacement of 4,500t - 4,880t and full load displacement of ~6,200t vs 3,900t standard and 5,500t full load displacement for Batch 1; Batch 2 length 142m and beam 17m vs Batch 1 length 133m and beam 16.3m), while keeping the same top speed at 30+ knots and the same crew size at 90, and increasing the Mk-41 VLS to 32 cells. The Batch 2 ships will be more capable in a range of areas than Batch 1.
Even with plans for Indonesia to construct 8 Batch 1 Mogami-class FFMs including the first 4 being constructed in Japan, it seems likely that the Batch 1 production run in Japan will be finished before Australia makes a decision about which Tier 2 frigate to acquire in 2025. If the Batch 1 Mogami-class FFM is chosen for the RAN, the Batch 1 production line might no longer be "hot", necessitating it being either re-started from "cold", or at least kept "warm", until construction is ready to commence, which could be problematic with the construction of the 12 Batch 2 ships for the JMSDF in full swing. Accordingly, if the Mogami-class FFM is chosen for the RAN, there may need to be a decision made as to whether to select the Batch 1 or the Batch 2 design in order to get the first three RAN FFMs into service within the timeframes outlined in the Surface Fleet Review.
These articles discuss the differences between the Batch 1 and Batch 2 Mogami-class FFM designs - if the FFm is chosen for the RAN, which do you think would best meet the RAN's needs?
Japan's MoD Awards Contract for New FFM Vessels - Naval News
Japan to procure 12 new FFM in just 5 years - Naval News
navalinstitute.com.au