I'm no expert, but I think that generally the freon lines are in the back of the unit, except for a line that runs through the outside and interior wall just behind where the door seals. Except for that line, the inside wall should be clear of freon lines. IMO, older fridges are easier to work on. I would be unsure what I was able to remove on a newer unit while keeping it working. For example, on some newer fridges, the main circuit board in the ice / water dispenser controls everything. On the older fridge I ended up with, I was able to strip it completely. The freezer was controlled by a thermostat and relay on the top of the fridge side, which was easy to bypass into an ebay temperature controller. The fridge side was controlled by a thermostat that mechanically opened a baffle between the two sides and which I removed completely. The defrost control was a small box that I just left in place.