Custom stick dual mod question

Ok I ordered a bartop arcade cabinet recently. Basically it’s going to be a mame machine and I’m pretty sure he’s using the i pac to hook to the pc inside of it. Anyway I know how to do some soldering because of repairs I’ve done and ect. I was wondering if I could Also wire 360 madcatz controllers to the joysticks without it messing up the i pac setup? So basically I’ll have 1 joystick with 2 different controllers wired to it.

Also I have one more question kinda random. Does the x arcade xbox 360 adapter have lag? I’m not getting an x arcade but might use the board inside of one with an adapter so it can work on both pc and 360.

If it’s hooking up to a PC I don’t see why you need the Ipac at all, I’d use the 360 controllers with the computer (may need to install drivers, but they’ll work) and 360 just to keep it simple. As for adapter lag, they all lag to a degree, some imperceptibly, I don’t personally know how laggy the X arcade adapter is. IMO, if you’re rewiring in the first place you should just wire in a controller native to the system you’ll be using it on unless you have a good reason not to.