That's a handy little welder. You will get your money out of it. I did 95% of my straight axle swap with one. Use the flux core on heavy duty stuff (may still need to make multiple passes in some cases), and use the gas when you need to do finer welding with less spatter.

As for the thin sheet metal, use the gas at a higher flow rate than normal to help cool the weld area. You will also probably need to do lots of small spot welds and "connect the dots."

'97 4Runner, '06 F350, '86 4Runner, '05 WR450
http://home.4x4wire.com/erik