Use 4xM3*4 heat inserts and 4xM3*8 counter sink screws for assemble.
Freecad design file included incase you need to make your own change.
Updated: V2 version extended the edge by 1.5 mm so that TF card can be protected by the case.You can put it in the bag without worrying about break the card.
The author marked this model as their own original creation.