Where to Start dissecting Stock ROM?

Hi, everyone. Been a linux sysadmin for 15 years, and have rooted and replaced ROMs on countless devices. I'd like to dissect a factory OTA update and build my own ROM (to share, of course!)

Now I have an Acer Liquid Z320 (Acer T012). There are NO ROMs out there for it. Nothing. However, I do have an update.zip factory update. The structure of this is pretty simple: a boot.img, several binary blobs, some configs and a few scripts.

So now my question: Where do I start?

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