I just want to start this by saying this probably won't be safe and definitely will not be a good unit. With that out of the way, let's get started. The united will be based on an old ac unit I got from a thrift store for 15$. It has a 1/3 hp rotary compressor and a decent sized condenser that I will be reusing for this build. Here is where the unit gets a little ghetto, the evaporator will be made out of a 2 inch offcut of 110 copper with a 2-inch diameter and the suction line is going to be made out of a manifold hose connected to a Schrader valve without the stem in it. I am going to use a cheap filter dryer off eBay and 0.031 cap tube. For gas, I am going to be using standard propane that will be run through a filter dryer as it is charged so it hopefully will get some of the moisture out