Nitpick: On the Grisha drawing, you listed the sensor fit twice, once in the correct place, and the other where armament fit was supposed to be listed.
Nice for you to spot that. I've been messing around with these drawings some many times over that something like that was bound to happen. I'll fix the template once I get home.
For Erik about the Tron/Big Wall (which apparently is another mistake from my part as that is one of the Komintern designs, should be Mars-Passat/Sky Watch in its place) it dates around same time as the OTL Mars-Passat or perhaps little bit earlier. The angled fit of the system is for the pr. 1153 carrier which OTL dates around 1973 for preminary design, I guess it would have entered in service about the same time as in this AU which is around 1979-81.
Interesting to note that the Sky Watch fits that saw daylight in OTL were in fact fitted right forward and sideways as you descriped. However the first time the system is mentioned is in the Pr. 1153 where the "Burke" like arrangment. But I'm not sure how far that system was in the terms of operationally when the models of that project were made. Perhaps it was more of an artistical appeal to fit the arrays 45deg and later when the system was first fitted on Baku it was already chosen to go with the straight forward/side 90deg arragement.
I will return to this matter once I get to the carriers.
Coming next: L/M Moskva, some research ships, pr.26bis, Pr.1144 remakes and Project 1143 complete redux.
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