Step 1: The Electronics
Note that if you etch your own PCB the LED's are mounted as normal thru hole components but the IC's, links and other components are placed on the copper side of the board. The LED's and links will need to be mounted first as the AVR covers some of the LED solder points. Details in the pictures.
Step 2: The Display
The first three photos show the strip board version, the remainder the etched PCB version.