I've started the installation of a wall unit above the frig. The shelf and vertical came out by just twisting them by hand. the vertical was held to the top and bottom by the flat nails used to attach wood flush. Flat pieces of steel that are wavy, don't know another way to describe. The shelf came out the same way, was stapled through a horizontal 1X1 behind the back of the cupboard. It also twisted out by hand. The back of the cabinet i cut out with a carton opener, the bostisch type, took awhile but worked fine. the next step is to cut a hole to the outside for a vented cover. I'll wait until i get a cover then go for it. It seems solid enough to use a saber saw, I'll let you know how that works. Still nervous about it causing the thin fiberglass sheeting to crack away from the cut. I have two different brand 5000 watt window units and the outside measurements are almost identical, so it should be easily replaceable in the future. One insulation I saw here used a non opening vent, actually they said two covers mounted side by side. If i can find some that will work and look good i'll probably just drill alot of 1 inch holes behind them and let the exhaust a escape through the holes. If it doesn't allow enough air out i can always go back and use the other type and cut the complete hole. My thought is a lot of holes instead of a big hole would maintain more of the integrity of the outer wall. I'm converting the frig to strictly 110 AC so won't have much warm air competing with the air. Will post more as I go. I have taken picture of what I've done so far, not sure how to post them, so if wanted I can send via email to you. You can email me at randydavilla@gmail.com.