Outlined below are the remaining steps to have a functional prototype:

Software:

-AVR code for handling interrupts(from zero-crossing) and timers

-AVR code for communication with ADS1118 (I have a previous library I wrote for it)

-AVR code for PWM output to the optoisolators

-AVR code for serial communication (Libraries exist)

-AVR code for LCD interface (Libraries exist)

Hardware:

-Connect LCD

-Research off-the-shelf soldering irons

-Test ADC spi interface

-I feel like I should throw some buttons and LEDs in there somewhere for good measure :)