I worked for years to get to this point so you are doing great. Here is the only changes I would make:
Get rid of the z-rest sit pad, cut down the z rest to a torso pad, and then use your pack with your 'new' z-rest torso pad to make a complete pad.
I did this for the first time in Montana last May on the BPL Scout Leader training course. We saw some wind and rain, it was good.
I guess I didn't see you beenie?