I just put mine back together not long ago so it's still a little fresh in my mind. Nothing should be welded. If it is, it's not factory. The rear is only held together by the large rear brace. I remember there being 2 bolts per side. The other cross braces are of course bolted to each strip of wood and along the sides to the wheel wells or the side of the bed. The wheel wells have about 20 bolts that hold it to the bed side. The front panel has 3 or 4 bolts that hold it to the bedside and then all the bottom bolts that bolt to the wood strips.
Wait till you get to put it back together. FUN!
