This is our organizational chart last year (available as a link off of
www.massacademy.org/first).
This year we split in a similar manner, and reassigned some jobs.. but the general idea is the same. The main positions are held by WPI mentors and this year, they will also have non-rookie students of the team as co-leaders these divisions.
On my old team we had similar setups. It works out really well in terms of making sure things get done, because the responsibility is always someone.. and with a heirarchy there is a system of checks and balances to ensure things are working orderly
hope that helps a little
