A complete overhaul of Mystic Pines and added a complete working settlement with workshop; beds and food, electricity, water and defence ... Chances are that it won't show up in your pipboy as a settlement. Although it could be a new game start is needed for it to work. Still figuring that out ... But, you can do a trade line with your first settlers walking in Mystic Pines to another settlement you have. The line will show up in the pipboy map.

Just connect all the wires to attract settlers!
You'll need all DLC's, except for Nuka.

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https://www.patreon.com/Madrox
MdX