I love the stuff you guys are building. The ladder looks sweet! Not sure how this would be possible, but if there was a way to mount it to the side of the vehicle without a rear bumper, that would be sweet! Southern Style Off-road has something similar but requires a rear bumper. Or maybe a fold-away ladder that latches onto the the roof rack. I’ve seen the new Defenders having this option. They also have a external side panel storage options. All can be latched onto the roof rack.
For the external side storage, here is an idea:
Products | Joe's Original Equipment
Some images to bring it home: