The current keg box door design is shown in both the EHBP-03 and the EHBP-04 plan sets. There are also many photo in the Builder’s Gallery.
Go to the gallery https://www.barplan.com/gallery
then click search and enter the search term “keg box”. You should get at least two pages of photos.
One new approach for the keg box door is to make it a tighter fitting “hatch” with no hinges. That way there is no “swing” and hinges just aren’t needed on a keg box door. Just use 3 window latches left, right and top, just to be sure.