You definitely shouldn't swing it around, the entire sword is only held together by the end of the blade twisted onto the pommel. But the teeth on that pommel are polyresin and very easily wear off or even break off without much effort. That would cause the blade to fly right out of the handle...
Unfortunately stainless steel is no better a material for a sword whatsoever. When it comes to something a large and heavy as a sword stainless is a very poor metal to use and is very prone to breakage when made as thin as a blade. On top of that the hilt and handle material on those stainless...
Actually he does sell those, they are made from fiberglass resin over a solid core. I remember seeing his work a few years ago and was very impressed. They can be found over here
http://www.fiberglassblades.com/Blades.html But the prices are a little high for some people. The quality though is...