I think you made the right choice with screw into plastic and captive nuts. If you’re not going to take it apart, I think that’s plenty. I recognize people like their heat set inserts and they’re great for panels that need to be removed from time to time but for me, I prefer to screw it and glue it for most things, and captive nuts for the rest.
Look up Microsoft in the early 90s and how we all got through it.