The core framework will be the core framework. My overrides are what need to survive upgrades of the core framework as new versions of ContentBox come out.
I’m finding there are several things I want to override from contentbox (all objects that get/set a timezone specific datetime instead of a UTC datetime, security objects to enable greater encryption). I’m actually thinking a switch on the object’s name (getMetaData().name)) might be better when considering a number of possible overrides.