For the welding side we started with several gas welding projects, including butt welding with and without rod, vertical welding, welding up 1/2" holes, brass brazing steel to steel and copper pipe to steel. Gas welding uses a lot of heat so it warps the sheet quite a bit but it leaves a soft weld. Simply hammer and dolly-ing right on the weld straightens it right back out. Pretty neat.
This assignment we had to simulate bullet holes with a pick hammer, much like those that are often in old cars out in the fields. Then using a hammer and dolly I straightened them out and welded up the holes.
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-Ben, Your friendly neighborhood Rendering dude, PM me for info!