http://www.lincolnelectric.com/knowl...compactmig.asp
Here's a good article about aluminum welding.....if you can get a mig setup your welds will be ALOT prettier eventually. Sounds like you are doing this for the experience so this advice may not be useful but if you are doing it for economies sake I recommend that you get all your material, cut it and fit it getting all your angles right and then take it to a local shop and have them run it off....most of the work is in the fitting and a good welder who already has the machine set up can run it off in not time.