I got the head and carriage off without too much difficulty:

More importantly, I confirmed that I am also able to get them back on.

The carriage moves back and forth pretty easily, although something seems to be up with the mechanism to advance it with each keystroke. I think the gears for the type wheel are kind of janky, too, as it tend to stick in the down position.

Those are all probably fixable issues with time and patience. My bigger concern is that I am pretty sure the bars holding all the keys must have gotten squished together horizontally at some point, as the key in the top and middle rows hit and nudge the ones in the rows under them.