I have just purchased a 4 Player Simpsons cabinet

And I want to convert it to a Mamed Cabinet, I was going to use the JPAC to connect it to the Arcade Monitor, Controls, Sound etc... (might change the sound part)
what i want to know if i am going to also have a 7 button (neo geo & MK series) can i plug a ipac in after the jpac for the extra buttons etc....
I want to keep the Jamma Harness i.e for pluggin some Jamma Carts
I have also got the Arcade VGA Card, and a Ipac already and a CP (so have all buttons etc...)
Any ideas on the best way of doing this