This is my design for the Nuka Cola Cap Clock. It is about 7.5 in across. The hole in the center for the clock movement is sized as it is. If you scale it the hole in the center will change.

I printed this on the Prusa mk3 with supports and did a color change for the lettering

I added the Nuka Cap only file with no hole for the clock movement so you can add you own.

I have included a .step file of the earlier version on my Nuka Clock that can be brought into Fusion 360 and made into whatever you want