I did what I always do, grab the stock image from Google, break it down, add my own root and busybox (not the ones in the kitchen, they are older).
Then I use my updater-script that I hand built from prior releases along with matching binaries.
Pretty much that is it. I am going to look at yours in a minute and I will PM you what I find.
EDIT: Sorry, I didint mean to cut you off on your thread either.