A nether hub has been the topic of many discussions. Most of which were in game. Using a thread to list build methods, responsibilities, and times for builders to meet and work together here could be very beneficial.
In response to your post:
Part 1 – Why limit the number of players on the build? I could understand searching for good builders to help but why only 5?
Part 2 – Builders of community projects will not get special privileges or titles. We have been looking into a website awards system to where builders of public projects could get a medal or badge on the website but this is still in the infant stages of development and may not be implemented at all.
Part 3 – I would suggest inquiring here about the interest of others to participate on this project and letting each person post their desire to help and area of expertise. This way each can post with their own ideas to help improve the overall project rather than exclude builders who, you may not have meet, have showed an interest in this project before this post (there are more than 5 people who have expressed an interest in this project to me.)