I'm not sure that footprint is the right word. Let me rephrase the question.
You have four 2 1/4" trackballs, mounted with an Atari 2 1/4" mounting plate. You are going to make 2 CPs. One of them is CP X. You are going to put two of the trackballs in it, side by side, as close together as possible. How far apart would the centers of the two trackballs be? Your answer will be the X dimension of the footprint.
You have four 2 1/4" trackballs, mounted with an Atari 2 1/4" mounting plate. You are going to make 2 CPs. One of them is CP Y. You are going to put two of the trackballs in it, one on top of the other, as close together as possible. How far apart would the centers of the two trackballs be? Your answer will be the Y dimension of the footprint.
Repeat for the following items:
Ms Pacman/Galaga Joy 4-way with Oscar joystick mounting plate
Happ Super 8-way
Happ Microswitch pushbutton