I don't do chins as part of my routine but I have a pull up bar attached to the ceiling at the bottom of my cellar stairs and my rule is that every time I go down there (my man cave is there so I go there a lot) I do as many chins up as I can (or pull ups for a change).
Dips get rotated in there but only when I know I'm going to a gym.
This is a skull crusher: www.muscleandstrength.com/exercises/ez-bar
This particular routine is my new 8 week routine. I'll take a week off and then alter it. Actually, I alter exercises listed every other week but not the "core" routines like bench, deadlift, squats and press I include those all the time.
I do leg extensions and in the past I did screw up my knees so I go a bit lighter these days. I have never heard that leg curls are bad for the knees, huh, learned something new today.