Who told you that? I would seriously advise against it. You will end up with parts everywhere, and, from past experience, a large group will never do anything with the sections. From a builder/designer point of view, you want input from people who actually build the subsections. This is done by getting interested parties to give you their email and sending them parts. This way, you know if they are not serious or not. I don't want parts or models posted in threads, it makes the threads harder to handle, someone won't know if they have "Rev. 1" or "Rev. 2", etc. Better to get a small dedicated group of two or three people than many who do nothing, and do it off forum, where you have absolute control.
I'm not sure who told you that was O.K., but it is something I frown upon, unless done in private off of the forum, where you can do whatever you wish. Think how the thread would look with people posting their builds of the sections, some just getting it wrong, and the continuity of the thread getting lost. The integrity of the thread would dissolve. I would implore you to do this on a private, off forum basis, so you can get a serious group of people who wish to participate. If a person is not willing to share an email address with you, then they aren't worth trusting with all your effort.