First could I ask where you live?

Second, There were 2 other Aluminum Cats. The "Great Lakes Catamaran", a US company. The only one I saw had a keel formed from a standing welded seam. It looked like a pontoon boat with sails. The other was a French built boat. It looked "Dart like". I saw it in unpainted, polished aluminum. I was pretty.

Third, over the years I have seen a lot of boats built from aluminum or steel, including some beach cats. The story usually goes something like this, "I wanted one, I couldn't afford it, my brother works in an aluminum fabricating shop, we built it after work, and used the rig from a ????". They are usually very strange and end up in someone's back yard. There were a couple that were pretty neat though.