Jackdaw: looks like a basic brig. You could do this one yourself if you like. You'll need:
TX Convertor:
https://piratesahoy.bowengames.com/Cloud/Tools/Modeling+Texturing/TX Convertor.zip: converts the game's .tga.tx files into standard .tga format, and vice versa;
Hex Editor:
https://piratesahoy.bowengames.com/Cloud/Tools/Modeling+Texturing/hex-editor.7z: directly edits a file;
GM Viewer:
https://piratesahoy.bowengames.com/Cloud/Tools/Modeling+Texturing/GM Viewer.zip: shows a single model file, such as the hull of a ship
Start by using TX Convertor to convert any of "bortoutbrig1.tga.tx", "bortoutbrig2.tga.tx", or "bortoutbrg45.tga.tx", all of which you'll find in "RESOURCE\Textures\Ships". Those are the files used by "Brig1", "Brig2" and "RN_Brig" respectively, all to be found in their own subfolders of "RESOURCE\MODELS\Ships".
Use your choice of Photoshop, GIMP, or any other picture editing program which can work with .tga files, to make the ship look more like
Jackdaw. Save the file to a different name which
must be the same length as "bortoutbrig1". Use TX Convertor to convert your new file to .tga.tx format.
Depending on which "bortout" file you chose, make a copy of its ship model - for example, if you used "bortoutbrg45.tga.tx", make a copy of the whole "RN_Brig" folder and call it "Jackdaw" or something similar. The names of files in the folder all begin with "RN_Brig" so you'll need to rename the whole lot to match, e.g. "RN_Brig_deck.gm" becomes "Jackdaw_deck.gm". Now use Hex Editor to edit "Jackdaw.gm" and look for the name of the .tga file:

I've highlighted it here - it won't be highlighted on the real Hex Editor screen, but you can see here what you need to find. Change that to match your new file and be careful not to overwrite anything except the file name, otherwise the model file won't work! This is why your new texture file name must be exactly the same length as the original.
Once all that's done, use 7-Zip or something similar to zip up all your files and upload the whole lot here, then I can do the coding work to put the ship into the game.
HMS Prince looks like a very dark man of war. "Manowar_gub" in the game looks relatively similar. It also uses a simple "bortout" file for the texture so you could follow the same instructions as for
Jackdaw. The ship seems to have tattered sails and a fog similar to the
Black Pearl, which could probably be done by using code similar to that for
Black Pearl in the game.
The game already has a
Queen Anne's Revenge based on the one from the "Pirates of the Caribbean" films, so an AC version is unlikely to go into the game as well.