Try looking through my rebuild thread. I utilized much of the same method that SMB did on securing the lower cabs, they are through bolted to the floor with large angle brackets and the upper cabs are screwed into them, with a few screws and smaller angle brackets to brace the uppers into the birch ply wall panels, which were carefully screwed to the inner wall bracing. I used truss head screws, both self tapping metal and wood type. https://www.sportsmobileforum.com/fo...ild-22536.html
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'03 Ford E350 7.3L Diesel
(de)SMB'd Custom RB-50
Quigley 4X4 w/Deavers & Agile Offroad's R.I.P. package
CCV High Profile Pop Top
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"understeer is when you hit the wall with the front of your car, oversteer is when you hit the wall with the rear of your car, horsepower is how hard your car hits the wall, and torque is how far your car moves the wall."
In reality there are very few screws attaching the actual wall panels to the van metal walls (top & bottom). The walls are attached to the back of the cabinets with L-brackets or via the window boxes. The cabinets are securely attached thru the floor.
"Cabinet sides are bolted down through the van’s steel floor using 8 to 12 special steel “L” plates. Cabinets are also secured to the van’s sides, and other appropriate points."