I have recently recommenced work on this from the next part which is around 70% complete, and hopefully in the not too distant future a new part can be posted. I've gone to considerable effort to dig my books, notes and sources out of boxes from my house move years back
(as mentioned here) and added to other more recent material I have acquired, there's a decent amount to work with in terms of the research and notes I have already involved myself in. It's almost hard to believe the first part was posted over 15 years ago.
If there's still interest (and by this I mean comments since I'm experiencing an issue elsewhere despite me busting a gut to update and my efforts just aren't generating much), I will continue this, if not then, well, I won't.
Many thanks,
Sargon