Well, I'm just participating in my first group build (the P-40 Warhawk), but I'll give you
.
In answer to your first question, if by 'see' the other people you mean actually meet them in person, then the answer is no since we are scattered across the globe.
As for your second question, a camera isn't necessary, although others would enjoy seeing your work. My personal feeling about a group build is that it's a way to share in a similar interest; to give and receive advice, tips, and information; and to motivate each other. Don't let a lack of a camera dissuade you from participating; the more the merrier!
Mark