Brass and woodwind instruments are very different beasts though. Plastic clarinets for instance are mostly found in marching bands due to their inferior (brighter) sound, and those instruments are certainly not all plastic. Most woodwind instruments are mechanically intricate, so I'd be impressed if someone could make a pTrumpet version of a clarinet or bassoon (I'd be just as impressed by a pFrenchHorn). Note the difference in sound between a plastic and wooden recorder, one of the simplest woodwinds. I played on a plastic bassoon for the first year, and they do not sound good at all.