That's thin stuff for a mig. You may have some burn through problems if your technique is off it's mark. You will want a mig which has shielding gas as the fluxcore variety tend to burn through worse. (deeper penetration) Is the welder you mentioned a fluxcore wire unit or a small stick welder. The stick would be even worse for burn through than mig or fluxcore. Tig would be best, but I have no experience with it other than to understand it offers better low end heat control than any other process.

The best luck I have with thin sheet metal is brazing with an oxy-actylene outfit. You would get less distortion that way also, since you don't take the metal up to as high of a temperature. You would have to design different joints and be able to tolerate a different colored joint though. An oxy-acteylene kit is a less expensive than a tig or mig welder too. As a bonus, you can use it to cut.

Depending on the sizes and shapes of your arts and crafts you might want to try a spot welder. I understand that companies like Harbor Freight sell them.
Chet Guilford

Check http://www.eastwood.com (1-800-345-1178 / stitch welder, stk no 19045) a gizmo that attaches to your hobby welder that reduces the current to about half. I have one but haven't tried it. They claim it will do sheet metal as thin as 22ga and it likes 1/16" drag rod.

In fact, if you haven't purchased yet, they also have a hobby welder and a spot weld gun that may just work for your hobby welding. Good luck and shoot us some pictures. Grumpy