sofakng,
I too am interested in this. From what I've read, it will require wiring everything through some quick disconnects and then plug and unplug them in as needed.
My situation is that I'm trying to figure out how to do this and still get power to my P360s. I think I'm leaning towards putting the disconnects or some kind of switch in between the joysticks and buttons and the IPAC and the console hack. That way I should be able to leave the IPAC plugged in and get the +5V from it to power the joysticks.
Man... trying to get consoles and PCs to work together is hard. Especially if you want to use the IPAC for the PC.