That looks like a fun project. Good job.
So the benefits are:
New board with new capacitors/resistors.
Cell powered clock.
The advantage of having a plus version (more chipram)
Satisfaction of doing project.
Did I miss anything?
Colour Composite output from the vidiot? if not there's the S-Video add-on which should be better quality anyway (nothing beats the RGB though, well except a digital output DVI-D/HDMI add-on maybe).
