Tgps in their own exclusive domain?

[GeorgeTH]

I disagree: providing you have already a decent domain name for your gallery traffic it might be to your advantage to use the main index.html (or php/shtml = set in htaccess) for your TGP.
Main advantage: so many surfers try the main url once they find a gallery they like - this way they end up at your TGP = some free traffic from you own galleries.
And you can send all 404 traffic to the main TGP page (you can do that anyway - but this way it's easier...).