Peppe, almost all (if not all) Japanese battleships, armored cruisers and many protected cruisers did have their 6 inchers shielded by Elswick or Armstrong type shield which are so similar they they would look identical in 1/700. However, looking at all the photos of Akitsushima, I don't see the upward angling part of the shield roof which was a feature in both Elswick and Armstrong shields. 12 pounder gun shields lack this feature as well and, since this part of the shield wasn't hinged and couldn't be folded or unfolded, I don't think that Akitsushima's gun shields were neither standard Elswick nor Armstrong.
Looking at all those photos and this drawing from your post:
download/file.php?id=47565&mode=view I think that maxim's idea looks better and better
