It might be a bit extreme but we could drop the door the whole way down and cut his head and hand off (more Jedi related gore).
I think it's fine as it is, the poor beast could have fatal internal injuries with only minor external ones (it seems to have very thick skin) but mockups might help rule one way or the other.
Someone should do a mockup poster in the style of Jaws but with the door a killing poor starving Rancor (DOORS : The Revenge).
