This is a good fun project. I made mine from 6mm aluminium plate. A friend got some plate water cut using a quick jack he got from Finish line or somewhere as a template. He had a few sets cut so I grabbed a set and welded mine together. I changed the shape a little as they were a little long in my opinion.
This was one of my first attempts at welding aluminium with the MIG. It turned out pretty good. I've bought an AC/DC TIG now so there's no need to mess around with the MIG on aluminium any more.
Since this picture I've linished them and given them a brushed finish rather than polished.
Cheers