I have my galleries set up on domains relatively the same man.
www.smut-archive.com/galleries/
is the main thing, now you want to make sure and put an "index.html" in that folder so if anyone goes snooping you can redirect them towherever you want.
Inside that smut-archive.com/galleries/ place serperate folders for categories if you like say
smut-archive.com/teens/
smut-archive.com/gay/
smut-archive.com/mature
etc...
inside those you can name them as you like.
smut-archive.com/teens/001/
smut-archive.com/teens/002/
each one being a seperate gallery.
Now the main thing is jkeeping your galelries seperated for tgps.
When you do your recips, just simply keep sainvg index2.html, index3.html, index4.html respectively, and submit that html page to the proper tgp... am I making sense? this is how I do it anyhow.