First, let me propose a "model" that may help provide some guidance. If you think of how a chamber of commerce works, I think that will be similar to what you hope to achieve operationally and therefore structurally. To make it easier, consider a local chamber of commerce. Businesses become members of the chamber, usually by paying annual dues and submitting an application/registration (membership is open and the application is not really meant to be part of an approval or acceptance process, although there can be an adherence to certain shared goals or values). These members then elect a board to make decisions for the chamber. It may be that these board members also serve to execute the directions of the board in smaller chambers; larger groups will often hire someone to act as "president," executive director," or "CEO."
Hence, I think your first consideration is how businesses/people become members of #mwstake. Are there different classes of members? (it may be simpler to start with just one class) Are there membership dues, how much, and what basis (annual, bi-annual,etc.)?
How will members then elect the board. Usually the election begins with some nominating process. Boards that exercise more control usually have a nominating committee, with open nominations having to go through some qualification process, such as requiring a certain number of members to sign a nominating petition to have their candidate placed into nomination (to avoid having hundreds of nominees).
Will there be any restrictions or qualifications on nominees? For example, will board members represent geographic areas? (example: two board members from North America, two from South America, two from Europe....you get the idea) Does it make more sense to have industry representation, or role representation? (wiki users, developers, etc).
Since #mwstake operates in the tech realm, I am assuming there may be some sort of online meeting or election to choose the board.
There is also a choice between electing an entire board each year, or some other schedule, versus having staggered elections. The latter provides some consistency and institutional memory as it is common to only have a third or some other part of the board elected and subject to change each year. That also makes it harder for a complete change in leadership in the short-term, which can be good or bad depending on one's view of the board at the time.
As I mentioned before, the customary officer positions to fill are those of president, treasurer, and secretary. I find that these titles and roles make sense to most people without detailed explanations. Since you are starting small, you may want to consider electing these positions from the initial board. The president would then also preside over board meetings and any general meeting (which could be online). The treasurer would handle finances, and the secretary would record and handle the official records, including who is listed as a member. As #mwstake grows, you may then consider having someone act as an executive director to carry out the day-to-day operations of #mwstake.
Keep in mind that what you set up now can change over time to serve the needs of #mwstake. You should finally consider how these changes to the bylaws would be made. Changes can be made by the board, perhaps with a super-majority vote, or you may choose to have bylaw changes submitted to the membership, either after the board proposes the change or some percent of members petition for the change.