Chapters? After, definitely after. A potential solution to the problem of "what now?" after the heathens have been dealt with. No offense, 1000heathens.
Huh. My ex-wife used to say the same thing.
With my vestigial thoughts on the Iron Hoplites being ground down to the point of filling their ranks with mechanicum constructs, I'd say Perty would most definetley champion a "chapter" system. I got a double-dog-dare idea, though. How about we come up with a different system other than Chapters?
A Centuriae of 2,500 Astartes?
A Phalanx of 3,000?
I like this. 1,000 always seemed like an absurdly small number to be operationally efficient in the way the fluff describes them. I mean they have the resources of an entire WORLD in most cases. They should probably have the manpower to accompany that. Not to mention the loss of one company is a catastrophic loss to a traditional chapter of Marines, might as well give them the capacity to actually sustain losses.