Kenmore fridge with broken air tower repair
So I have a Kenmore fridge with an air tower part W10396926, it is broken and has missing pieces, the frost builds up quickly and it's out of control. I looked everywhere for the part and nobody sells it, unfortunately. I would like to build a new one, is that possible? What would I need to do so? I was thinking of using 2inch insulation foam boards (the green ones) and carve it to shape but I am really unsure how to proceed. I am really trying to avoid paying $600 for a new fridge because a $20 part has no replacement.