Alma, I've checked with Hiraga's archive before too. The plans were not well preserved that most of them are too dark to see the details. Nonetheless, the two new 88 fleet books that I've mentioned (1. Gakken, "The 8-8 fleet plan", 2. The battleship & battlecruiser of the 8-8 fleet) actually took heavy reference from the archeive and other source.
The Gakken book provides a clean up copy of the original plan (a collection of the Yamato Museum in Kure) that was drown in 19-9-1921(during the construction of Amagi) of which is the base that I've made my model. The plan that we seem in the Hiraga Archive was drown in Sep-1920, 3 month before the construction of Amagi, and was a general plan for both Amagi & Akagi. The appearance of the Amagi that shown in the Gakken book was also the same as I could seem from my another reference book. I could not help but trust the newer one. BTW, even the plan from Hiraga archive shown the revised single funnel, rather than the 2 straight funnels in the Fujimi kit.
plans from Gakken:
Plans from "The battleship & battlecruiser of the 8-8 fleet"
1. As schedule:
2. Revised during construction:
3. Plans of bridge levels (BTW still with some errors...)
In addition, actually Fujimi was not make the model directly base on Hiraga's archeive. Fujimi make the model base on a scratch build model of Akagi from a Japanese modeller. The modeller is Mr. Yasuyuki Yonenami. His work was published in "Navy Yard Vol. 12" (Autumn, 2009).
Although Mr. Yonenami did a lot of research, of course including the famous Hiraga Archive, he did admitted that he have difficulty in figure out the actual "look" of Akagi's bridge, And so he had to make from guess from the builder's model of Kaga and that of Nagato class battleships. You can compare Mr. Yonenami's model and that of Fujimi's kit and notice they are almost identical.
Lastly, I posted the drawings of Nagato & Mutsu's bridges just for comparison as to show how the "old" line drawings of Amagi resemble them, not saying they are drawings of Amagi (sorry for those guys who coulnd not read the chinese words in the drawings that clearly written they are Nagato & Mutsu)...
So sad, as Timmy said, the Fujimi kit was not a true replicate of the IJN Amagi.