If it’s truly brainless then I don’t see a major ethical problem. But I also don’t see people being allowed to do this because it’s much too far past the “yuck” threshold. It’s gross and disturbing even if technically it is ethical.

I also think it would be way harder to do this than it sounds. The body would not develop properly past the fetal stage without some kind of artificial stimulation.

Printing organs is probably both more likely to work and more likely to be accepted.