Google for forums where someone posted it? I mean all you do is drop the rear, pull the rear carpet out, wire wheel the paint off the box seams, weld them up, then bolt the torque box reinforcements in and then weld them in too.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.