Traktor controller? How to interface controls?

Ok so i've decided to that maybe my best option is to build my own traktor controller for 4 decks!

I want something with really easy control of all decks (no crazy multikey bashing to switch to a different deck or function)

Something with Play, Cue, Cup, Loop in, Loop out, Loop size, FX, 8 cue points all of it X4 so each deck has it own bank of controls!

I won't add mixer controls because thats getting a little beyond me i will just have an external mixer

My original design was pretty ghetto but for my first test of the controller it would work i was going to use a usb keyboard and solder all new controls ignorantly i assumed a keyboard had a nice little pcb with all the solder points available

Turned out to be a piece of celophane with weird stuff on it so i've been researching new stuff i see lots of people using gamepads but with 100 + buttons/pots its not ideal using 8/9 pads

Then i see the arcade controllers using HID im wondering whats better to use however the interfaces i have seen look like i might need 2 or maybe more to get all the controls, i believe i could settle for 2 deck of controls and a shift to switch them but i would prefer 4 sets

http://www.leobodnar.com/ the top three boards are the ones i was looking at

I would prefer not to go the whole massive midi diy route because however im pretty good soldering im horrendous at electronics on a whole


My main concern is using two of these at the same time will they conflict or both have identical controls ?