I am modifying my old mini fridge and same issue, freezer at the top. Its a U shape, Kenmore fridge. I was able to get the freeze detatched easy but getting it manuevered has been a chore. Its a 13 year old fridge so afraid the hoses may be brittle but so far holding up.
My main issue is the freezer plate is large and I don't want to bend it back any farther to tape to the back wall. Right now the freezer plate is hanging in the back, it seemed to work when I plugged it and the keg fit. So I may leave well enough alone. Unfortunately I don't think I'm going to be able to fit the co2 tank in this fridge. Its small 3.3 cubic feet but I didn't want to drop $350 on the Nostalgia model which has cheap parts I've heard nor did I want to drop $200+ for a new fridge to F it up.