I'm interested in this as well. My first choice for a persona (in the SCA) was too early period, IMO. So, I moved it back by 2 centuries.
Tim and I live in the same city, so is that enough for a chapter ? LOL..
Tim, what about "Ancient Lives" or something like that? There used to be a publication, in Meridies, I believe called "Early Period". It covered those personas that were very early period.. or before the medieval period in some peoples opinion

It had great articles, from how to make early period shoes, quoting where and when they would have been used, to other articles of clothing.. and other everyday stuff. I'm pretty certain I still have those newsletters, because they had such helpful information.
Let me know if you want me to dig them out. I don't know when it started, but I believe it was around for at least a couple of years, before I heard of it. At the time, I was one of only 4 or 5 pre-600's personas in Atlantia (AFAIK and I traveled a lot). I believe the newsletter just gradually faded out, but it's existence shows that there interest out there.
Perhaps some of the Meridians out there could give us more information on this?
FWIW, I think it would be nice to see people with similar personas, camp together. Like the Viking camp (yes and the other examples at Pennsic). Rather than sticking out from the later period pavillions, camping together I think would look cool.
I'm more of an inclusive than exclusive person, but there are times that the broadness of the SCA is more troublesome than not. I'm all for having specific areas designated for x.. time period, having a specific event with a "theme" of a specific time and place, perhaps even specific battles. I"m not interested in "recreating" that specific battle.. down to who would die or not. But I believe it would be interesting to have the sides have appropriate weapons (armor if possible).. and approx. amount of effectiveness (the weapons).
I think it would encourage people to work on a specific time and persona.. or several

It would make it easier to picture ourselves back in that time, if we didn't have a 2 century Roman next to a 14 century Englishman.
I wouldn't want to tell people they couldn't do their persona, that's not my point. My point is often, there are enough people with interest in x.. time or period, that I think we could do more with it, under the SCA umbrella.
I've rambled enough. I would like to see some early period groups out there. In my browsing I've run across a couple on the web, they are several here in the USA, but they aren't very big. It looks like several of them also tend to attend some SCA events. just FYI..
Thanks,
Tessa the Huntress
tessathehuntress@earthlink.net