Thanks! I put it aside for today and will probably only get to it on Tuesday evening. If I don’t hear any other comments before then, it would seem that going from the inside is my next best choice. Thanks for the words of confidence!
I got that EXACT FRIDGE and am in the process of modifying it. I've been able to chisel out enough space for both kegs, but I am out of my depth in finding the lines on the top of the fridge... I'm really paranoid about drilling through the top, and the cornstarch/alcohol thing didn't seem to...