As said in the description

Your file path to this mod in the workshop folder will be like this:
"C:\Program Files (x86)\Steam\steamapps\workshop\content\268500\2972466021"

This is where you'll be able to find all of the files for the mod. In Modbuddy, create a project, name it what you want it to be, then go to that file path and transfer the folders and content to it. You won't need "KPPTemplate.x2proj, ModPreview.jpg, and PublishedFileId.ID" and you can transfer the ReadMe.txt if you want some information on how to upload it.

Finally, keep in mind that whenever you transfer a mod file (as you can do this with almost anything not just this class) you will NOT need the Script Folder as it is created automatically when built/uploading (it will not show up in your Modbuddy).

This is really appreciated!
One dumb question, though: where can I find these files locally?

I've long been looking a mod like this. Thanks mate.