Memorial Pet Urn and Collar display

WE recently had to put down our fur baby and we had him cremated for my son who was having a particularly hard time. I designed this in fushion 360 to hold the urn as well as be able to put his collar on it. I struggled to make this because i an in no way tech savvy. Please dont ask me to make changes i wouldn't know where to start but feel free to do so if you know how.