Here we have the passenger side Torque box split in half (bottom half showing) getting ready for another trial fit.  Note that I have pre-drilled holes to weld through.  Also, I have split the torque box open to allow it to be installed with the inner rocker welded in place.

Bottom of torque box is installed for fit and clamped for welding.

View from wheel well looking down at torque box as clamps are being applied.