Well, i might remember you that working means that is still not finished, and as the island design is based on Taiho and i have some drawing showing Taiho from port side i can look there for details; also, real design can be accurate to the smallest detail possible because they can be based on pictures of the real vessels and must show exactly what the ship really looked, when it comes to never built ones there is always a small margin of interpretation left to the artist drawing it (or at least, that's my idea about the argument) or, for example i could have drawn only 1942 montana s designed and not 1945 and 1948 one, because while whe know what could be on board judging from how the US navy built ships in the same period whe have no actual sources showing appearance, and that's nearly the same thing here with the never built Ise versions, as the only drawings circulating are quite approximative.
Obviously this will not be intended as diminishing your assistance, as i said i'm just trying to explain why i tend to work in that particular way