Before anyone asks, I'm asking this in the Chaos forum because, well, I'd prefer the opinion of the Chaos community over the converting community. I definitely respect the converting community, but my primary concerns here are: Will this be acceptable? Is this a good idea? Will I be able to play with these conversions anywhere? And: would the community have objections to this?
Anyhow -- after the buildup, it really is rather simple -- I'm considering building an Alpha Legion from Chaos-converted Orks: Grots as (adorable little) Cultists, a nicely modeled Ork as a Lieutenant (with very Orkish 3+ armor, as well), and 'Eavy Boys as Havocs, with various other Orks thrown in for flavor as "filler" Marines (also, of course, with Orkish 3+ armor, and probably some mutations).
With some demons packs, a nice Grot-riddled Defiler or Pred (either one will do) and an Orky Dread festooned with symbols of Chaos, I think it could be a nice and fairly effective list, as well as being good-looking, flavorful, and touching on a little-covered area of fluff -- the fact that other races reside in an around the Eye, and are just as likely to have been tainted by Chaos.
So... any thoughts you might have on this (either in general or in response to my concerns listed above) please let me know.