Summary

I used Nuka Cola Clock by techoutreach for the cap shape but scaled it down and made the hollow in the back conical so its heavier. It'll still accommodate a clock mechanism 65x65x20 or smaller, but there's no hole in the back for mounting.
Pause at:
Red to 24mm
Orange to 25.3mm
Black to END
Source items are here if anyone wants to make changes:
https://www.tinkercad.com/things/73v3gvI6NtB
The cap is separate from the logo so it would be easy to put something different on top.