Braced up the back of the box with gussets made from the original control arm mounts.
trying out some shock set-ups, going to have an upper cross bar, will add verticals from the lower frame up to it to help strengthen it. It's a pretty tight fight, the center of my arms are smack dab in line with the upper frame tubes
...figures ... At some point i think i'm going to cut that tube out completely and put a straight tube in going to the front = more tire clearance.