I changed the No-Co for a Samsung 197 three years ago. Our furnace was under the refrigerator also. I removed the platform under the NoCo and installed a new platform at a lower height, encroaching on the room above the furnace. This gave me the space to fit in the 197.
The refrigerator doors have to be removed to get it in the front door, and I even took off the front door and its frame. After it was inside the coach I had to install the doors before placing the 197 on the platform. (Our coach did not have enough room to put the door bolts back in when it's on the platform).
There are other threads on this topic; read those too. You will want to seal the overhead vents for the gas refrig, and close off the outside vents as well.
I just found an outlet that worked from the inverter and ran a cable to a new outlet box for the new refrigerator.
This a doable job, but it takes some planning. Read all the older threads you can find and figure out which most closely apply to you.
I will tell you that it is 100% worth it. Every day, every way. If you want to boondock, get a couple of solar panels to help keep things charged up. I have two 100 watt panels, and would add two more if I were boondocking often.
Good luck and keep in touch.
Tom & Jan ---- Westwing43 (RVM28)
2008 NEWMAR MOUNTAIN AIRE 4528
Pulling a 2014 CHEVY CAPTIVA