I post this schematics here for our experience member to have a look at it and work out source code for it,,i got this diagram from http:// www .ncus.org.uk
i feel is a good project except that it is large with a lot of logic ics.
Frankly, I don't think it is a good idea to construct this one; it looks a little bit old fashion ..
Yoc can find several more contemporary "moving message" projects here in this forum ..
One of the latest, for example, can be viewed at:
For the other projects use the SEARCH option ..
Regards,
IanP
BTW, the GIF schematic you included is indecipherable ..