Well, we should have to work our way up from newbies to higher ranks, but at first have the officers from the old II core. It'll help to maintain guild integrity.
Trust me - in my old WoW guild we made one newbie an officer because he was a friend of someone and he freaked out and kicked pretty much everyone of a lower rank than himself because someone called him names in guild chat.
Anyway, basically, what I'm saying is that newer members like myself would need to throw in a lot of work and prove that we're in for the guild, not that we want to sabotage it.
At first, older members should be officers and as time goes on, move them up to Upper Tier officers, so newer people can take over as lower tier officers, then as lower tier officers become upper tier officers, previous upper tier officers become Panel Officers, second only to a select few including the founders.
Like this:

Invictus - Top Level Members, basically Guild Leader only.
Invictus 2nd Gen - Honored Members, people who have ascended to Panel officer rank and beyond, or people from other ranks who have shown dedication (ie donated cash to the guild or something of that nature)
Panel Officers - Top ranking officers, basically they're the authority to see if you can't reach the Guild Leader.
Upper Tier Officers - There to help out the Lower Tier officers if they need it (second line of defense)
Lower Tier Officers - Manage and help out ordinary members.
Member Groups are pretty self-explanatory.
The arrows going between the groups show how people may be moved between groups if one group isn't doing well, or if one is doing too well and outdoing others too much.
EDIT: And possibly more divisions being added on if we get enough members. I'm thinking probably regiments of fifty members, with three or four lower tier officers, two upper tier officers. I'd expect that we'd hit about 150 members in about a couple of months if no better guild show up, and probably level out at ~300 tops (estimating here, bear with me).
That's my two (more like twenty) cents.