This case is actually just slightly wider then the mints tin and also slightly longer. Curved sides and would make a real nice hand comfortable mod. Very close to the mints tin but a softer touch to it.
I kind of like the interior of the box and might try to keep it but it would for sure get some cuts in it for mounting the battery. Just not sure what all I`d do there myself yet.
The pictures below are just made up and not working mods.
I like side mounted switches. And think this would feel good in the hand. I would mount this on the hinge side of the same side the battery was being mounted on. Same with the atomizer connection although I`m not sure I wouldn`t angle it slightly towards one of the sides rather then straight in the center.
Or a button type switch still has plenty of room to go on either side with a 18650 battery in it. I don`t think this set up feels so natural in my hand though but that could just be me used to all the side mounted switches I do.
This really wants to be modded. But my plate is full for right now.