Well, it's been a year now from when I started this Light Logic project and after a slow start it has come along nicely IMO.

Let me just list the successes I have had so far to date ( Oct 28, 2019 )

All the basic logic gates :

     Non Inverting Buffer, Not, And, Nand, Or, Nor, Xor and Xnor

S-R Flip Flop

D-Latch Flip Flop

Astable Clock Flip Flop

Seven Step Self Clocked Sequencer

One Bit Full Adder

Tri-State Buffer

From these building blocks I should be able to design a basic processor using only diodes and resistors as the main components and a hand full of capacitors for a sequencer.

This is so much fun......Can't wait for next year :-D