Except that it was WWII. If you look into them, you find out they were flying Dauntless dive bombers, TBM Avengers and F4 Corsairs off the decks of these paddle-wheelers.
I don't know if there's any plans available (perhaps the Museum of tech in Chicago where they have U-505?) but there was a spread on them in 'Scale Modeler' a couple of years ago where somebody had built a model of USS Wolverine. There were some really good pix of the build and the finished model, you could clearly see the paddle wheels and the entire structure supporting them.