I'd be happy to give "unofficial" recommendations. Here they are:
I'd suggest a board that is not too complicated, but where you can add categories as needed. (Maybe the two who designed boards can collaborate on the final one?)
Capture some of the material here and have a "resources" section. The hotlines, grief counseling site, and anything else you need. Add additional resources as needed.
Put up a legal disclaimer. Be sure you say the board does not replace professional counseling.
Have a "statement of purpose." Such as, "This board is a sanctuary to provide mutual comfort and support for those who continue to grieve about Michael's passing, and also to find ways to embrace the positive, once more." Something like that? Your choice. . . .
Cut-and-paste the more significant threads from here, giving credit to MJJC as the original site for those. At least some of the "How are you all coping now" thread, for updates on how everyone is doing.
A private board is best. Using the same screen-names will help with clarity about who is who. (If you make it a public board, you will attract trolls and haters.)
Select your leadership. It's better to have two administrators, at least, and not just one. Have "mod-controls," although there will probably not be much need for modding since this is a "self-selected" group.
Be sure and have a "positive" thread. I'd suggest a group project, when you are ready for that. Maybe making something to send to Michael's children and/or family? Just a thought, but it would help to memorialize Michael and think about the future. (Remember the quilt that was a group project Shannon designed, here on MJJC? Something like that, where each person contributes some part of it?)
Take care of each other. You are very special people.