I'm working on mine too.
There's very little good data on this that's out in the open. In addition to the lower mods, you will need to do some trigger and safety mods.
I shipped mine to WLA, they did the mods but I can't get a good idea of the final assembly. I'm getting the impression that there's a mod needed to the 'drop in' parts also a mod to the safety.
At this point I'm at a standstill.
Keep in mind there's the Vector method and the WLA method. They're not interchangeable (IIRC).