My impression is that you're not so far off from Orthodoxy either, at least in some respects, Ludlow. It seems like you've kept all your future NAs together in one list, but if I remember correctly, part of the Natural Planning Model is brainstorming a whole bunch of actions/ideas/outcomes/etc. and then organizing them. From that point, you would decide upon what the next action would be, and that would go into a context list, but as for the remaining information, that would be kept with the project plan/support materials, for future reference. So that when you completed the next action for that project, you could review the project support materials, and then choose the next action for those. Its a way of seeing that, without being too rigid and always having to reorganize.
Thus, while your grouping is a little different, I don't think its too far away from the norm, and probably a little easier to find NAs rather than having to pull out the support materials ALL the time.