battery dropdown box install

[zicc1835]

good evening I just spent a little over an hour looking for some pictures and info etc. of recent installs of these battery drop down boxes on our board in the search box. I bought one some years ago and plan on installing it on the outside of frame rail on the passenger side under the SWB fleet side bed closer to the cab. I know brothers, ccp and others sell these and I looked on YouTube for some info and didn't see the detail i was looking for any recommendations, pictures measurements etc. would be much appreciated thanks