Officers, board of directors, volunteers of non profit?

Oh gosh, you don't want to do that. The board of directors is supposed to oversee management to make certain that it is using the donor's funds wisely. You should have separate management commitees to oversee day to day operations, like you described, but the directors need to recieve reports from the management committee. Those directors need to be divided up into fundraising, governance, audit/finance and strategy committees. The directors are also there to serve as liasons to the large donor community - your corporate sponsors, your circles of rich folk. So non-profits need large boards - about 4-5 to do the heaving lifting and a dozen or more show up and give money. On the management committee, the executive director is in charge - it is a discussion group, but I wouldn't recommend requiring votes to take actions.