I hear u can fill an air tank and with a compressor ?!?
Problem is, that is not an air tank it is an Oxygen tank. Air is a majority Nitrogen mixture (only about 21% Oxygen). So if your using that on a torch set up it will not work properly. ALso, oxygen tanks are usually filled between 2000-2640 psig, so your air compressor putting out 150 max psig will not put much in. My advice, just pay to have your Oxygen tank filled and make sure not to have grease or any oil based products (telfon tape, etc) on anything oxygen.
Now, with that out of the way please tell me you have a Youtube channel. Your stuff its dope, and Im sure you could make money on youtube showing your builds.