I'm not a big fan of the pre-heresey fluff, although I do have the first three books in that series but have yet to start them as I'm catching up on other SM books at the moment. Your pre-heresey looks very well done with all the conversions, I also like how you've included some of the old old school mini's into your army as well. One thing about chaos they do lend themselves well to conversions. The Ad-Mech army is looking good as well.
Respects, Emperorsaxe