I would be very surprised if the 136 and 137 received 730s or 1130s amidships as pictured in those CGIs. Those CIWS are fairly tall and would seem to endanger helicopter operations, being located so close to the landing pad. I think it would be more likely for 136/137 to either retain their AK-630s or have their gun CIWS installed at another location, for example where the AK-630 FCRs are currently located. Or not have them at all, since 2 gun CIWS + 2 HHQ-10 launchers seems to be fairly excessive point defense for an 8,000t destroyer. Also, it is impossible for the 136/137 to receive an HHQ-10 launcher on top of the hangar since there is no room for such an emplacement. The 138 and 139 OTOH should have no problem receiving amidships gun CIWS mounts where their Kashtans used to be and an HHQ-10 launcher on top of their hangar. I think it may also be possible to have rear HHQ-10 launchers for all 4 ships on the same platform as the Shtil missile launcher and have enough room to fit a VLS at the same time.