Here are some pictures of a mini fridge i made from 1 peltier unit, 2 heat-sinks, 2 small fans, some corrugated plastic, sealant, a 10 by 5.5 inch piece of cardboard tube about 1/4th inch thick, a piece of glass, and super glue.
I also added another layer to the fridge to make dead space of air in between the inner wall and the new outer wall i would recommend adding insulation between the 2 layers. i also made the door double paned with glass and double sided foam tape. and finally i added a better fan for the peltier hot side heat sink and a fan for the cold side heat sink.
before it only got around 12 degrees of temperature drop now it gets around 25 to 30 degrees Fahrenheit temp drop.