An interesting bit of the history is on the SEX amp product page, about 20% of the way down.
Before there was a commercial venture, there was VALVE. Now that back issues are posted, there's another history resource - and a lot of fun reading too.
I agree, it would be nice to have at least some list of versions, when they were produced, and how to tell them apart. Every so often someone shows up with an old amp, either dragged out of the closet or recently purchased used, and wants to get it running - then I have to do a bunch of research to figure out what they have.
I'll be pretty busy for a few months, and not ready to take on a new project. But if something gets going, I'll contribute bits as time becomes available. I wonder if we can fit it into the context of the forum? The old Wiki was a great idea but was too easily trashed by spambots.