First of all hello everyone and please apologize for my English.
This is my first post and I already ask for help

I have read many post and many site looking for help on that but to be really honnest I didn't find many things except this post
http://forum.arcadecontrols.com/index.php?topic=51353.0 and the official documentation
http://www.groovygamegear.com/PDF/MLED-WizManual.pdfI have planned to make a mamecab, I have no problem with woodworking, painting, software but I must recognize it, I am not very skilled with electronic (and also technical english documentation

)
So I just need a few help/advice on wiring/design control panel.
First of all before reading my long and boring explanation, my target is to do that (I need less button than he got) in this post :
http://forum.arcadecontrols.com/index.php?topic=72753.0
Unfortunately, he didn't give information on the wiring

and I promess, if I reach my target I will do a "light wiring for dummy's <like me>" post

I am planning to have a 2 player panel with 2 8ways joysticks, 8 lighted buttons per user, start (1/2), coin (1/2), lighted trackball, mouse1/2 buttons and it seems that admin buttons is a good idea (tab, pause, menu, vol+/- any other suggestion will be appreciate)
I want to RGB lighted the 8 buttons and the trackball, if i totally understand, that means that I need 8*3 = 24 output + 3 for the trackball so I need 27 output for the LED which means that an 32 outputs lighting from GGG will be enough.
First question can I wired button and LED in the same GGG (ie : button 1 on output 1 and RGB on output 1/2/3) for me it makes no sens but maybe am wrong ?
Other thing, is that true that if I want to light up the 8 buttons in the same way I can wired them together (like button1 p1 led on 1/2/3 and button 1 p2 led on 1/2/3) ?
Instead of that for buttons, and joystick I need another interface, is it possible to melt I-Pac and Led Wizz ?
Thank you for reading me if anything isn't clear or need precision I will be glad to help you helping me