Ah, these are great, and take me back to the first time Chaos Space Marines really caught my eye - I still have a soft spot for the Night Lords as a result of the original studio paintjobs, especially the champion waving his chainsword in the air.
As somebody with BL army as well though, I have to say these are really well done!
Also, in case its useful, the later edition of 3E/4E plastic miniature arms are pretty compatible with the older minis. You might find them helpful for getting a few different or better poses, especially for the CC weapon armed marines, and the shoulder pads are also pretty universal if you find yourself short of the originals.