That's pretty cool...does he list a source(s) for that info?
It's all from historical effigies. I think he just looked at them and counted up how many were equipped with what.
It's from Doug Strong, he lists his sources at the bottom of his main site. His info gathered for that page is VERY impressive. If I remember right, he also runs EffigiesAndBrasses.com?
I've always been drawn to the bascinet with houndskull visor. I don't know why, maybe because it just looks MEAN.
I believe the internet and forums such as this have had a profound impact on the advancement of SCA armours from all periods. In the old days (my first armour photographs were taken with a Polaroid Instamatic camera) I was inspired by books, movies, people I met at SCA events and the local Ren Fair. This was a rather limited pool for period correct historical inspiration and good information was slow to be disseminated. With the advent of the internet and forums for people with specific interests, the trickle of good information has turned into a torrent of knowledge. The younger members here can be very thankful that you didn't have to wait weeks for a book to arrive via inter-library loan. 
I've been around long enough to remember that. And the books I could get were the Eyewitness books, which had a scant 4-6 pages of very generic info, and a few basic pictures. Still, enough to make a high schooler aspire to have his own armor some day. Only slightly ahead of that was attempting to scour the internet for low resolution pictures or scans of armor at a *blazing* 14.4 kbps - all while hoping no one else in the house picks up the phone.
This is a great time for armor enthusiasts!
