Maybe something along the lines of a stickied thread in the Community Discussion subforum, titled similarly to this thread, wherein each post is for one member, containing their name, picture, and their respective memorial thread as a link?
As if it isn't clear by this post, I very much second this proposal of a memorial compilation. If there are no other good things one could say about this community, that one thing would be that when you are in the family, you are IN the family, and you may as well be blood-related. I've never encountered another online car club similar in this way, and this proposed thread would only further show that bond in this club.
"Idiocracy" wasn't a comedy, it was a documentary in-the-making...