Sorry to double post myself, but I've got some bad news - mine appears to be the '78 reissue. However, it is in mono, if that interests anyone. That is easy for me to do - I've got an Elmo CL that puts out a pretty good signal, and a Kodak 250s Pageant that has an EQ built in, so if anyone is interested in the audio, let me know.
Also, now that I think about it, mine would be a decent candidate for the non-special edition, as it doesn't have the CGI clouds. It might also be a fun learning experience even though it is not unique, so I'm still interested in building a 2 or 4k scanner, so advice is still needed!