Well I play the Kan wall and have been doing so for awhile now. It is a very fun army. At 1k you could drop one set of Kans and take more Boys. !0 man squads tend to not survive very long. At this points level I would say nothing short of 15. I am a believer in "more toys then boys" with this list, which goes against everything most Orks players believe. But it has not failed me yet.
I love the addition of the Dreads. Most will tell your they are slow or not worth it, but I have to diagree. I have found they are quit worth it. Even if they are just cannon foder.
I do not like the BW in this list. I understand what your thinking about getting more cover, but honestly it really isn't enough to do that. You would be better off getting some long range support in there with some lootas or Koptas, maybe even buggies. I also like to have an extra squad come in from reserve to help take home objectives late game or help with outflankers or DSer's that might be in my back field.
All in all you have a pretty good start to the Kan wall. Just some minor tweeks I think.
Anyways Good Luck!