Hey Guys,
I am building my first arcade atm and I just have a couple of questions about wiring
I am wiring everything up to an Ipac 2
Here is a pic of the cp (unwired)

Question 1
On the ipac I have noticed that there is 2 spots for ground wires. I was wondering does the ground have to start in one side and end up in the other side once I daisy chain everything. Or can I have to separate ground wires going out from the ipac and end up on the last buttons I wire.
Question 2
I have a four joystick with 2 buttons beside it as well as 2 x 8way joysticks with 6 buttons each. Do I just join the four joystick wire to the player 1 (8 way joystick) wires.
Question 3
I have installed 2 pinball buttons on each side of the cp(2 flippers, 1 tilt, 1 fire), Can I wire them into the ipac at button 7 and 8 on the player 1 side and then wire the other 2 buttons on the other side into 7 and 8 spots on the 2 player side.
Will this work
Question 4
I have an happ trackball and it has two green ground wires with a insulated ring joiner. Can I just connect it to one of the joystick mounting bolts for grounding or even one of the bolts on the trackball mounting plate.
Hopefully I haven't confused anyone
Any help would be great as I didn't receive any documentation with the ipac