The concept is a good idea, but not unlike many sites that have one forum but different models within it. For example, http://ozbenz.net/index.php (scroll down to "model specific").
Re: the gallery. Ease of use is the key to whether users use it. All forums have different rules and formats, which does make them a pain in the arse, but most of them also make life so hard with file sizes, file types, how they are attached, whether the program automatically re-sizes the photo, etc. Plain English would also help - for example, do you want a full size display, or a thumbnail ? It's an easy question, but no one asks ! There are a lot of people out there that have no idea how to re-size the photos that they have just taken on their digiital camera and all they want to do is get it into a posting. They don't want to know if a bmp file is acceptable or not, or if it has to be re-sized if it's 3mb - the program should be enabled to do that.
IF there was an option to add a file/photo to a posting, that included an option to put it in the gallery, I think people would use it. Using Photobucket is fine, but it does mean another step in the process.