Very good job. So happy to see the deveopment for our old phone continues.
Now, I can confirm Superuser doesn't work. Flashing SuperSU from recovery fixed the issue pretty fast.
Other than that the ROM is very solid and smooth. I tested SMS, Location services, Wi-Fi, left phone without a charge for a night. No problems so far. Will test bluetooth streaming later today in my car.
I have the same issue with calendar like any other non google build has, I have two of them, one is AOSP build another is Google's from the play store. That doesn't bother me.
Also, I still want to know what kind of "optimization" was done. Also, can anyone test MTP for me? I turned it on using USB Switcher, but my computer didn't recognize the device.
Great job, I hope the project continues.