I finished all three endings, that being institute, railroad and the brotherhood. my character is the default protagonist with some minor addons, i have pimped out the castle and theirs loads of gear in the safe under a bed.

Installation guide:
Simply open the downloaded folder and place the file in your fallout 4 saves folder, which is located in your documents/mygames/fallout4/saves you'll know your in the right place if you see fallout4.ini and the saves folder itself. 

extras:
If you wanted to see the video of the endgame then simply search it up as all endgame videos are the same.