Another option would be to sell that one and use the proceeds to buy a version that works. Home depot has sales on fridges that do not have a freezer, fit 2 kegs or 1 brew bucket without modification for $108.
I have found that some DIY attempts end up costing more than they are worth if your just trying for the end result. Now if you want to just have a DIY project and learn stuff at the same time...we have all been there and be sure to post photos.
Jeff