My suggestion would be, instead of boxes for the captioning, to use a two-point black outline stroke on white text and set the stroke's attribute to "behind fill."
Actually. There is already enough going on, that could look cluttered, I'd hate to have the text get lost.
It's probably better to use simple black or white boxes.
What I was asking before was, did you have specific areas already in mind for the captions? If not that's ok, I'll figure out something. I just didn't want to cover up the wrong stuff, if you had areas in mind already.
And do we have a title?
As far as the credits, is this OK...
Alex Ness - words
Hunter - pencils
Douchbag - inks
Me - letters
Correct you name to how you want it.