the lift kits are engineered for structural stability and longevity. a kit that you make yourself will not be, could have a weak point, and fail at the wrong time, in the wrong place and you may end up hurting or killing someone because one of your welds failed. (not saying it will, just hypothetical) using a kit you can buy takes all the guess work out of it, and you know it is designed to take the stresses of offroading. if it is a mud only truck, and will get from one place to another on a trailer, then it may be ok to fab something. i have seen some crazy stuff done to mud trucks that is in no way shape or form safe, but it is trailered everywhere and the only time it moves under its own power is to go through a mud pit.
if it will EVER see the street, buy a kit.
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