Either way, one is still stratifying the community with the 'guilds' concept. This in turn could still be perceived as a form of hierarchy, regardless of intent and relative ease of becoming part of said guilds. Mind you, even with no guilds, perceived hierarchies still form (newbies/old-timers dynamic, etc), so the focus shouldn't be on 'removing all hierarchies', but on creating an inviting 'atmosphere'. In this light, giving people more focused roles in order to guide the community better should achieve this, because to an average newbie, they come here because they are curious and wish to explore, not necessarily because this community is different from DV or LL (though, it might be the case for some, not necessarily all). So whether one perceives a hierarchy or not, the goal should be to create a system that works with the community, so that a newbie doesn't feel out of place and can easily locate appropriate persons in order to get inducted better into the forums.
Finally, on moderation, this community is still very small and very focused, and thus does not necessarily require moderation. However, it might become something to consider once the community reaches a certain size. For the moment though, it manages without because the community is small and well-knit, and since the board is very focused on a single goal (that of lucid dreaming). MM doesn't seem to get much of troll invasions, nor does it tend to dabble much with controversial topics/discussions/etc. So for the mean time, it is quite sustainable as is. Though, depending on how things turn out on the future, might have to be reconsidered (emphasis on depending).