That's incorrect. A component being necessary doesn't mean it provides all of the value, and the other components have value whether or not a finished good is produced. Labour costs money whether or not the project is completed.
>As most modern systems of values allow restrictions onnbodily autonomy, many including situations in which others have a right to take your life which is the ultimate violation of such autonomy,
You're skirting around the key basis of almost all systems of justice: you do have a right to autonomy as long as you don't violate other's equal right to the same. This is basically the Non Aggression Principle, and it has the effect of maximising personal autonomy.