I think that if the member list was setup to where each user had to be 'accepted' then something similar could be setup Jerry. That is the great thing about the Yahoo Groups is that you do have the capability to house those pictures in 'directories' if you will.
The problem with BBS's or Message Boards are that most have the membership setup so that everyone can join (like this great site). If you team the ability to house photos, the site will be wide open for hackers (because the uploads use certain ports that can give access to pretty much the whole site).
If a message board system could be found, with a lockable picture directory (or even a message board setup that membership has to be approved)...I think that this could be a very do-able setup.
Craig
Somewhere up in NoCo