Is it possible for gamesas members (who aren't in the Alpha) to access the C3 Alpha forum? I don't want to post in it, even if it was a "read only" access, just want to see what the people lucky enough to play it think of it. Would be very interesting for people who have followed the franchise and this site for a while.

I don't know, because the only place you can post pictures of the alpha without hurting the NDA is on the C3 Alpha Forums.

No. If the link were posted, it would allow anyone access, and therefore remove the 'Closed' aspect. The forum is for people who have access to alpha, nothing less. Also, adding a whole bunch of people who don't have the alpha to that area would cause unnecessary posting.

No. If the link were posted, it would allow anyone access
Not at all, because if the link was public you could share it with friends so it wouldn't matter if the link is posted or not. The subforum is probably open to the chosen users only.