Hey Greg
There are a few threads I started when I got mine. Marty was very accomodating and helpful in creating the Ocelot line (Mine was the first). If you need other images or have any questions, I'm happy to help.
Ours is pretty loaded with refer, furnace, water pump, dual vents. Wasn't sure on the furnace, but glad we spec'ed it. Very hand if your caught in a few days of rain. Great way to dry everything out. Cloths espically.
The dual vents are a good idea too. We did a fantastic fan on the rear one, good for cooking and cooling. The one over the bed is handy to adjust while you are sleeping. Didn't get the rear window and have mounted spare fuel there anyway. Don't use the outdoor light much, but might if I had little ones running around. The stock galley is about as efficient as one can have. I doubt one can make anything more useful. I miss some of the outdoor cooking. But there's no endless trips to and from the truck to setup, cook, cleaup and stow the kitchen.
Also, if you do want to make your own, talk to Marty. Don't tie in both ends of the cabinet to the ends of the camper, for instance. It will limit flex of the camper and cause problems. As I said, their design is really efficient storage wise. We have the standard ATC couch. There is some good storage under there. I might still rebuild it to be 1/2" taller for a few things and their cases. Haven't had anyone sleep on couch tho. There's just the two of us
Hope this helps.
S