That is looking great man.
:drool: When I have the doors off mine, I'm constantly grabbing at the rockers for support or as a "handle" when I'm crawling over obsticles. I'd run a lateral bar through the front two door openings (see the chop). The roof of the cage looks pretty stout, but I'd definitely triangulate the "pillars". Sorry for the shitty chop, its the best I could do in 10 seconds.