When I was thinking about my Ocelot shell build, now completed, I took a look at Alleycat's build. His did not include the side window. I wrote him a note and asked what had been his thinking. His thinking mirrored my own. My thinking was that the side window is an easy place for someone to gain entry if I am parked while out hiking in a remote location, provides a large entry point for cold infiltration, and limits the interior design options. I asked Marty not to include the side window. For ATC that's not a problem.
My current build gives me a six foot counter on the passenger side with shelves above and storage below. Great kitchen work space! The driver's side has a full six foot settee with an adequate table and seating for two. The table is on a zaguan arm that allows that table to easily move fore and aft as well as up and down. The best part for me is that I have a full length, 30 inch wide bed that folds down from the driver side wall. To deploy the bed, I lower the table in 10 seconds, deploy two feet, and lower the bed. The whole operation, either up or down takes less than a minute and could not be simpler. So, when on the road, no need to pop up the top just to take a nap. I have, after a long day, used this lower bed when parked in a restaurant parking lot, and been inconspicuous, not looking like a full on camper in the middle of any town.
And yes, no need for a ladder to come down from the upper bunk when nature calls at 2am.
Yes, I gave up any views from the settee. The upper windows, power fan and the sliding front window should provide me with adequate ventilation. With my current solar and single lithium battery setup I have lots of electric light as needed. In the unlikely but possible event that I need an emergency exit, I like others I have read, keep a dedicated, very sharp kitchen knife ready to quickly cut an opening in the soft material above. I'll take the risk of a minor injury that might be incurred in that kind of exit in order to have the design I have created. Additionally I have a very adequate fire extinguisher that could/should allow me to put out a fire that might block the rear door exit.
I am still very much a newb when it comes to this popup truck camper business. I have been out only about 12 nights in total. I created my design and did the build out with intention that I could go solo, as a pair with a dog, or a pair and a grandchild. I definitely built to enjoy in the shoulder seasons and with current set up think I could do winter snow trips as well. I did install a Propex heater. Time will tell regarding snow trips.