A fine looking collection Rob!
The spring loaded hinge pins is a nice solution for lots of possible issues. My most common is forgetting to put the lid in place during assembly.
Another way to remove the lid is with a razor blade in the gap. Small bites into the dowel and push it into the lid. With the right side tension it'll stay in position for the next push. Kinda like pushing a door knob bolt with a pocket knife to open a locked door (not that I'd ever condone or admit to that)