Well, my interrest in the ATtiny13 circuit was due to the small requirement for physical space...
An ATTiny13 with a WS2811 - some transistors and a 75176 or similar...
I am trying to figure out, if I somehow can put a DMX RGB circuit inside this 3D printed part (with minor adjustments to the back piece):
https://www.thingiverse.com/thing:2051738I know, that I probably will have to use some 1.25mm spaced JST connectors for DMX IN/OUT, but that is the least of my challenges...
There is a physical limit on the PCB, that should hold the circuit - approx 17x11 mm

... And I would like to try to drive a 3W RGB LED with it (not full power, though - I think total current will have to stay below 200mA in order for the LED not to get too warm) ...
A 20 pin SOIC 2313 takes up too much space - and I am not sure, that I will be able to solder a ATmega328P in a 32 pin TQFP package by hand ...