In addition to the two downloadable AI Sea King Mods
There is also an AI model in the main game. I am not sure why its not usable in game at present. Its a low res model but just a small tweak to the database entry and you can have an AI SH-3W.
To install I recommend using JSGME or OVGME. The file will overwrite the db_countries lua file in the Scripts/Database area adding the SH-3W to the USA and UK. I haven't tested if it is IC compliant.
For a manual install unzip the folder and locate the db_countries lua file, copy and paste it into;
DCS World OpenBeta/Scripts/Database