This is a case I designed in Fusion 360 for the Dreamweaver 4N Jr soldering kit from Cyber City Circuits.
The board simply sits in the case and is held in place by four screws. I used four M2.5x5 screws.
The 9V battery can sit in its cubby, or in my case, I used a small piece of double-sided tape to secure it in place.
I also placed cabinet bumpers to the bottom to keep it from sliding around my desk.
The blog post to accompany this thing can be found at https://3darduinogeek.com/2021/01/06/soldering-and-playing-with-the-dreamweaver-4n-jr-from-cyber-city-circuits/.