It would be kinda a pain to do now that it's after the fact, but you can upload pictures in each post. That's what I do in my build threads, then they're attached forever.

Also, yeah the forum does have a member gallery area. Look at the top of the page, next to "User CP" there is a link for "Photos" If you click there you will see a "add gallery" button - you could try using that. I'll admit though, I've never used it lol