05' nissan 350z

This ia all info i got on it. Have not done one yet but what are you doing to vehic.?

Remote-Start, Security, Accessory, and  Audio

I've never heard of that module, but, it would definately be worth a shot.  The BCM (drivers kick) has a data bus wire from the door that I would assume would be the tie in point.  Otherwise, as I'm sure you know, you will be trying to run two wires through the molex plugs in to the door, not fun at all.  If the customer complains about the price just justify it by telling them that the BCM sits right under the molex plug that goes in to the door.  Once you put wires through that plug it will no longer be waterproof and there IS a chance that water will drip on the BCM (and its cheap plastic housing) and will eventually cause it to fail.