This would be difficult, especially when multiple players in a clan can build a single base. I do it all the time with my friends. There’s no way to differentiate your pieces from someone else’s, or if you didn’t build the doors, you don’t have access. This only really applies to a single player building or something. Also, if they applied it to a whole clan, imagine being in a clan and you kick out someone who was toxic. What’s stopping them from coming back and robbing you blind because they still have access to buildings they worked on? While I understand your purpose, it just doesn’t make practical sense. There’s too many factors to consider.

All that being said, I gotta ask, what exactly led you to this idea? There’s ways to transfer your buildings to another clan if you’re the only player or last player in it, but if you left a clan and someone else is in charge of it currently, you’re SOL. If the latter is the case, you’re pretty much that player I mentioned above… the player they DON’T want robbing them blind. I’m not saying you’re toxic, or that leaving the clan wasn’t amicably done, but I can’t imagine them wanting you to have access to their stuff… even if it use to be yours.