Victron BMV / MPPT Monitor or Circular Dial Mount

I've recently fitted a Victron BMV 712 to monitor the level of charge in my campervan's leisure battery. The display for it can be recessed if you've got the space. However, the best place for me to fit it was an outside wall of the van, so recessed fitting wasn't an option. You can buy a surface mount box from Victron, but they aren't cheap! Why spend a fortune when you can 3d print your own?

I believe the following Victron models will fit:
-BMV 700
-BMV 702
-BMV 712
-MPTT Control

I'v