you need all the motors and little thermostat and sensors to make it work properly , i think j30 and q45 have similarly settup climate controls...i would look into that and probably an ac shop would be able to customize something for you or guide you .
I'm currently in the process of doing this as well. First you need to make sure you get the climate control and the harness that goes to it. Then another big piece you need is the havak? motor, this replaces the analog cable for hot/cold. You also need the JDM sun senser JDM blower motor senser, all in all I believe you need at least 4 of the JDM sensers but you can use parts out of Q45s and Maximas for the remaining sensers.