I got one of these as a present a few years ago and have been using it in the garage just for bottles and stuff.
I was defrosting it the other day and realized that if it weren't for the freezer tray, a corny would slide right in (it also takes some door mods). There are coolant channels in the freezer tray, though, so you can't just cut it out of the way. If you unscrew the left half and (carefully!) bend the tray so that it's vertical along the side of the fridge, a keg slides right into the left side and a CO2 tank on the back shelf over the compressor.
You'll also need to either remove the interior door (maybe 20 machine screws and reattach the gasket, or else just cut away the part that interferes with closing.
I just did this last night, and haven't turned it on yet. Assuming I didn't kink or crimp or otherwise mangle the coolant channels, it should work fine. If I did, I guess I just ruined a perfectly good fridge. I'll let you know in the next day or two when I try to plug it in.
I only did it because the fridge was free. If you're shopping, you're probably better off getting a different fridge that fits a keg a little easier.