"Tech Ingredients" youtube channel built (https://www.youtube.com/watch?v=YWUhwmmZa7A) and then tested (https://www.youtube.com/watch?v=cw8ipUYodkE) such a thing.
Edit: Watched the freezer video. Performance is predictably bad, but not as awful as one would expect. Might actually be a viable daily driver with thick enough insulation or vacuum panels.