When I went through MedLab, we used anesthetized goats as our live tissue donors.
Using meat is a good idea. In practical applications, I found that suturing actual human wounds was problematic because of thickened skin and callus's.
Druged goats are a little difficult to come by.
Human skin is a bit thin...
Something extensively calloused is not a great idea.. It won’t heal.
Deep wounds and shallow wounds are totally different animals..And the stress on a wound can be a problem too.
Deep wounds frequently require some “Stay Sutures’..Simple skin suturing will just tear out unless you relieve the stress on it.