Cad design and 3d print of belt clip

Design details: I need a belt clip to house a small electronic device

Both 3d design and (small scale) 3d printing of clip required

Device needs to be encased within the clip to protect electronics, but:
- the device casing needs to be openable
- the battery clip needs to be exposed (both top and bottom) to allow the battery to be removed or replaced

CAD of device attached, plus my (frankly appalling) drawings of how the clip should be

Case needs to be close enough fit to electronic device/board to ensure it does not rattle when moved

Orientation of device within casing to be electronics front facing (i.e away from the belt clip part), with the largest silver electronic module (the bluetooth one) to be at 6 o'clock if the clip is being worn on belt

In time - design of a consumer ready product will be required - but this stage is for prototype only

Let me know if you have any questions
Ideas for the visual style: for prototype so not the focus
Preferred colors: yellow - but this isn't essential
Extra notes: Must be able to speak English well, and prefer UK based