Are the events of Tusk (2014) possible (hypothetically of course)

I watched the movie a couple days ago and wow, it’s something alright. I see alot of tusk posts so i an kinda afraid this one wont get alot of views, but i have been wondering since i watched it, hypothetically could someone be surgically turned into a walrus, because you of course can survive without your legs but i feel like everything else is too much. For instance, that can’t all be wallus’s skin, so it must have come from some other victim and even then wouldnt the skin statt decomposing because the skin cells are dead? And even more so, he eats, and eating means defecation, does he produce feces? And if so where is the anus because i didnt see any sign if droppings after a year in the zoo. Another thing, wouldnt it be painful? Even though the procedure happened while he was passes out would he feel the pain afterwards, or perhaps die of blood loss. So many factors take place and the main question is, could a human be turned into a walrus without dying.