I understood that reference
I've been super critical of the bullshit in this manga, but I'm totally willing to accept Deus ex Earth Magica for this; he already noted that he would use the von Braun-kun engines for a ship, and if you really push the limits of it, you can totally see elemental magic making up for the lack.
My problem is the fucking timeline for this shit.
They most likely modified a ship they already had. And like it was already explained, they have ways to move large amounts of earth and metals that we just don't. Going by our timelines would be kinda ridic. However, even using our timeliness, ships can be built quite quickly during war; during necessary times. WWI & II proved this. Ships, planes, the A bomb, factories, upgraded armaments, production plants, research facilities, testing facilities, etc... all within a small window of time, and with all the country's resources going into their manufacturing, WERE built. A year to modify a carrier? Even for us, that's easily doable and historically has been accompished.
First: I was going by peak production timelines and it still takes a two to three years - and that's with experienced and skilled builders who know what they're doing - and using laws of physics, buoyancy and materials we are familiar with.
