You can't build proteins at that scale from amino acids (I used to make proteins from amino acids). There are absolutely ways to catalytically control chiralit

You can't build proteins at that scale from amino acids (I used to make proteins from amino acids). There are absolutely ways to catalytically control chirality. See k Barry sharpless' Nobel prize, David macmillan proline catalysis, etc. Scale is still a problem. The mirror images of proteins are highly unlikely to be toxic in the way that thalidomide is.