I'm interested in this answer also.
I bought all the pieces you mentioned above, took them to a local stereo shop,
and had it all assembled with my Avic-Z2. Looks great!
Unfortunately, the shop didn't have any suggestions for wiring it up other than hardwiring everything.
If you don't mind my asking, what was the total cost of all the parts. Thanks.
I paid $105 for the parts. I live in Las vegas and the local dealership sucks for pricing. I ordered the parts online from Superstition Springs Lexus. They are located in the Mesa, AZ area. They have an online parts request form, which I completed, and I was contacted almost immediately via email by a parts rep. Very good communication and excellent pricing.
I happened upon them when I ordered a cargo net for the trunk off of Ebay from a seller named SSLexus.
Here's a link to their parts ordering page:
SS Lexus parts order page
Great...thank you.