Interesting. I’m surprised how far they went to be honest.
One thing to note though is that there are cross-members within the back door that might impede the shot, but only if it’s hit. Ditto for the inner springs of the seats.
9mm is fairly high speed round with a small cross section. Pass-throughs (in humans) are a real issue with 9mm ball, hence I carry only hollow point ammo. What surprises me is seeing the .45 achieve similar penetration to the 9mm. I would have expected it to lag both the 9mm and .40 in this test.