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Deflection is inversely proportional to the moment of inertia of the shape (profile/cross-section of your material); not only thickness and height. According to some online moment of inertia calculators, your example tubing has moment of inertia of 261525 mm^4; your example flat bar has moment of inertia of 83333 mm^4. So your example flat bar has less moment of inertia (about 4 times less) and it will deflect more under same load. You need about 50x25mm flat bar to have almost same moment of inertia of your example tube. On your previous post you said "As for the twisting motion, replacing the rear leaf spring suspension with something else might actually help too." Twist happens between front and rear suspension attach points, so you have to tie right front to left rear, left front to right rear to reduce twist; replacing rear suspension to 4 link etc does not accomplish this. In that video they added a hat section, not a flat bar and welded it to the inside of the rocker and created another tube inside the rocker that will reduce the deflection/sagging but not help much with twist.

Hallo Guys, After hours spent on this forum getting inspirations, searching for ideas and how to’s, I’m sharing my project too. Mustang was my childhood dream, and I finally got mine in 2013. I knew it wasn’t perfect, but it’s not easy to buy one for small budget in Europe and especially in here Slovakia because of complicated procedure to register car like this. I drove the car for 2 years, but I had no chance to pass the technical inspection in 2015, so I decided instead of only repairing – rebuild this car as it deserves. I started with disassembly in spring 2016 and over a year I had no time to move forward. Finally this autumn I finished work around the house and I’m in garage again.

picked up my car from the shop, the car flies with 3:50's lol lovin this ford 9" and also got my stereo installed, I can finally listen to music now and not just the wind blowing in my hair.

Very impressive on the framerails.

Well, you know how customers are, their always wanting something better:)

Thanks Guys, Some pics of torque boxes replacement. Boxes came with car (previous owner ordered them from NPD), frame rails I drew in CAD, and let them laser cut + bend. After epoxy welded in place...

looks like he had fuel injection. ill bet the fuel pump kept going after the crash and he probably didnt have an inertia switch.

Som pics from 2017 - disassembly...