Hi Graham, i'm not sure if it just me seeing this but the pics are all cloudy, probably as a result of them being hosted by Photphucket before they relented, or that their stupidity policy continues. I use Imgur and this provides nice clear pics and they are easily loaded on here.
Some years ago I made a pair of the Fostex suggested back loaded horn cabs for the 208 Sigma, but used the 206E as these worked in that cabinet. They were very good. The build was quite challenging given the number of pieces required for each cab. My local timber yard sourced some Baltic Birch Ply and cut most of the pieces for me. I used them for a few years until I sold them to a guy who used to post on AOS.
Big beasts at 10 stone each!