Thanks Kingsley and Fj4. I am not sure I like the idea of the back not vibrating, as on my johnny smith, i try and hold it away from my body when playing. You can hear the sound loose liveliness when it gets dampened from the back touching your body. Of course i would love to try one. If they were designed like that, who knows? Remember the old Maciferris (spelling) that Django played had a "resonator" built into it for just that reason. It was like a back inside a back that would vibrate to make up for the deadening effect of the back touching your body. Oddly, i played a hollowbody 2 recently and really liked the acoustic sound for something with built in pups. I could not get an electric tone I liked however. It had a maple top, and is much thinner than the arhtop, which piqued my interest in one again. I have not played one (archtop) in a long, long time. I need to try one again along with a ja and the new ps. Kingsley can you give me the link to the video you are talking about?