Update. We have a base going for Secret Bases (very punny...). Credits to KitsuneKouta for allowing me to use such a great script for this project. I plan on adding breakable objects and a system for changing bases, as well as bridge support over crevices.
While large objects will go into walls I expect the players to make their own secret base look to their liking. If anything, it allows more customization (lol).