They are both paper designs, T.K.M.S in the article seem confident in their design work to fit a Cea far system so perhaps beyond customisation
As I understand it, and for those with actual knowledge of naval design and construction please provide corrections when/where I get things wrong, but the detailed design phase is something which usually happens after a design has been selected and the contracting started. This I believe is because some of the kit required by a customer might not be known by the designer/vendor, as well as the specific requirements and characteristics for the kit. Such detailed information is unlikely to be gathered by a vendor prior to selection simply because the vendor will not know exactly what to collect. It is one thing to have a CEA radar panel located on the mast of a ship model, it is another thing to know that
XXX model radar panel, with a displacement of
YYY kg, needs to be located
ZZZ metres above the waterline, never mind what the networking, power and cooling requirements might be for the array panel.
I am confident that TKMS could do the detailed design work required to fit CEA panel arrays, as well as other pieces of kit Australia might request or require. What I am much less confident about is TKMS doing such work prior to being awarded a contract due to the time and costs involved, or TKMS (or MHI for that matter) being able to make design changes without it delaying the start and delivery for overseas builds.
As for the iterations of the
Mogami-class, these cannot IMO be accurately designed as 'paper' designs at this point, unless one was only referring to a modified
Mogami-class fitted with Australian specified kit. At present it appears that eight 'regular'
Mogami-class frigates have been commissioned into the JMSDF with four more under construction for delivery between now and 2027. Japan has also ordered the upgraded
Mogami-class to be built with work already having started on two vessels. Work that AFAIK would start after the detailed design had essentially been completed.