Building a Doduino

V-TechDesign published a Doduino build:

This project was an exercise in building an Arduino like ATMEGA328P board from scratch using a 3×4 inch Veroboard. The main objective was to provide better build-in I/O capability out of the box, so most projects will not need an I/O shield to perform common tasks. This makes the whole setup cheaper than trying to do this with an Arduino and I/O shield as well as a good Arduino learning exercise for new users.