Actually, if you read the various threads about playable ships, or adding ships or submarines to the game, you will in fact find long tutorials on doing just that.
At the top of this forum is a modding sticky. Inside are links to many things you will need. Unless you have the Pro version of sketchup, you cannot export obj files I believe, and getting it out of that format (sketchup) is also not something many freeware things (any?) will do.
A playable CV came up a few times, and I always say the same thing:
The SH4 engine is incapable of even the most crass approximation of CV ops.
The game will not engage (or DRAW, lol) enemies far enough away to be realistic. There is no way to require steaming at a given speed to create the right amount of wind over the deck. There is no way to send planes for a strike vs CAP, etc, etc, etc.
So it's a wasted effort, IMHO. SH4 manages submarine simulation OK. Not great, but "OK." The increased complexity of even unrealistic CV ops? Not in the least.
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