[dsraven]

looks like you need to jack the cab off the frame so you can get the patches on straight and proper. maybe a 2x4 spacer tool. you can buy in bulk at lowes, lol.
another great little tool is a small sand blaster. it gets into those rusty spots where you can't quite reach with the grinder or wire wheel. a 5 gallon bucket size works awesome. gotta have the compressor sized big enough to run it though. clean panels (on both sides) always leave a better weld because there is less chance of contamination from stuff in/on the metal. crap on the back side also gets drawn into the weld.