gridfinity 4x3 latching lid

This is a lid that makes use of the stackable lip of gridfinity box.  It has a sliding knob that can "kinda" latch close.  With the lid this thin, I was not able to find a good way to make good friction fit to make the latch work better.. 

So if you want different size, or if you have better idea on improving the latch, please remix away!