its all system dependent... How big the fridge is... how powerfull the firdge is... how hot it is outside the fridge. personally i would leave the door closed, but if its not burning hot durring summer time, you prolly wont notice condensation accure to quickly on fridge items, especially if there left in the fridge.minutes? thats not fast enough at all. it only takes seconds for a droplet of water to fall on your mobo (or any exposed electronics really).
im not saying any of this cause i think its a good idea.. im mentioning stuff incase someone hear has the time ands thinking it would be fun just for the hell of it...Now if you were to cut the box off, use that plate to directly cool the water, and mount a few fans on the hotside, then you just might get the thing to lower 10F. I don't think its really worth that amount of effort though.
if u modify any AC system, u cant be rough with the lines/compressor/condensor connections. or loosen any connections.. refridgerant in the system will evaporate instantly into the atmosphere if there is any breach in the system, no matter how small, even if u cant see it. If that happens, only way to fix it is to reseal the system, then add the refridgerant. but u cant add the refridgerant without a machine to remove moistur/maintain propper pressure. thy sell some refridgerant in small handheld refill containers, but if u use one of those, it wont run correctly cause the moisture and whatnot. and the performance will deminish back down to nothing.