Hi, Greg .
Unfortunately, there is virtually no information on which shipyards may have installed the degaussing cables on the Asashios, nor as to whether or not there are variations between ships. In fact, AFAIK, there is only one photo of the class members that is clear enough to show the cable, that of Arare in April, 1942.
The aft end is indistinct, but certainly the forward half matches what Hasegawa has molded for its new Asashios. In the absence of any other information (though I do have one other, 2nd hand source that I will check tonite), I guess we can only assume that this is correct.
While I don't know exactly what Hasegawa used as a template for Minegumo's change of platform, I will note that: 1) other DDs that entered the yards in late 1942 for repair began to receive upgraded AA fits, 2) Minegumo spent 3 months under repair from bomb near misses in Oct, 1942, not departing Yokosuka until the beginning of Feb, 1943, & 3) the revised platform matches schematics for Yamagumo and Michishio in June 1944, though they have slight indents at the leading edge of the platform. This is a long winded way of saying it's probably correct, though adding the indent couldn't hurt. My opinion.
HTH,
Dan