User contributed gallery

Hi,

Sorry if this is going to be long explanation, but I really hope somebody here can help me.

I'm building a gallery site right now, and I want to make it a user contributed gallery sites.

Let's say I have 6 different categories, when you click a gallery you will then come to an overview of all the 'post' in the category, every post can have up to 3 pictures each, and a small comment.

I know this can maybe easy been done, by letting the user be a 'author' and then just let them make these post. I do however find this really complex for must user, and I wanted to make this in a form instead. Like this

------------------
Category
------------------
Image1
------------------
Image2
------------------
Image3
------------------
Comment
------------------
Submit
------------------

And the no more, when the user has completed this form I will automatic be created as a gallery post, and I would have to approve that before it gets released.

Would something like this be possible. I was thinking maybe can a plugin like Gravity Plugins already do this ?