I doubt you'd even get as far as hand-making the brushless motor that powers the compressor. And that's just the start - the fluid dynamics to design an efficie

I doubt you'd even get as far as hand-making the brushless motor that powers the compressor. And that's just the start - the fluid dynamics to design an efficient compressor is years of study in itself. It's easy to underestimate the complexity of everyday things. But note that fridges are 100 years old, and today's fridges are much better than the fridges of 100 years ago. It took the collective effort of the human race 100 years to get this far.