Arthur Kromlech is a very skilled sculptor and his resin quality is very good. I think they lack the same detail as the likes of Micro Art studios, but make up for it with their resin quality. I hate assembling micro art stuff no matter how beautiful.
This unit sounds pretty epic. I have been thinking of doing the same with ordinary boys. To improve them a lot why not try using some gas masks from Puppet Wars or Kromlech? They would probably work quite well. Also, even better: check out Teeks guide to modelling the
AOBR ork poses, it's brilliant.
http://www.dakkadakka.com/dakkaforum/posts/list/242444.page#3330006