Just one more quick update, before I post the final video to twitter, for everyone to see!
Not including any future polish (and polishing never really stops), I'm considering this feature 'done', now!
The most visible change is that there now is an 'aiming' animation, to give better visual feedback that a car will get yeeted, once the player lets go of the button.
In addition to that, enjoy these two short GIFs that highlight some of the inverse kinematics:

Since I am calculating the trajectory in advance, I know where the car is going to land; so I'm just having the character look at what they are aiming for!

Also, after the throw, the character will keep looking at their target for a bit longer – just to make sure they really hit, hah.
As with all IK animations there is some jank to it, and you can get ridiculous results when you turn around very quickly, etc. – but I think it adds a lot, to make the character look more alive!