Where are you going on your trip? My wife and I did 10k miles around the US, but the Jeep was totally stock and no RTT so the back was just a big pile of stuff held down with bungee cords. Not ideal.Totally understand where you're coming from, it's definitely an aggressive change to the interior.
In my case, Im going to be living in the Jeep full-time on the road, & using it as a mobile photography/videography home & office. I shoot around the clock, day & night, and take naps throughout. I really need the organization for myself, its going to be very helpful. I have a million little items & need to know where they all are at all times, especially at night when its pitch black out and my camera is shooting a time-lapse and I cant turn any lights on (which would ruin it).
The reason for the second platform is for emergency shelter, & nights where I wont be able to sleep in the rooftop tent during severe storms or insane wind. It also blocks all of my gear from view hopefully killing the temptation to break in.