I actually tried the naked approach before, about more than 10 years ago. I had a small piece of 3/4" particle board attached to the upper right hand corner of the stock chassis acting as a cantilevered armboard and that's it. The turntable was just sitting on the table by its belly with four stock small rubber pucks. It was pretty naked, think of a naked person wearing a right hand glove. I had an MMT arm at the time, I think.
It didn't sound all that hot because I remember later on the same arm was mounted on a McCurdy radio station metal frame type of plinth and sounded better than the previous set up. And my custom butcher block plinth also sounded better than the naked approach but I had a different arm so that comparison is probably not valid. I guess I can always try it again with a different tonearm, like one of my Audiocraft arms.
All I am saying is that I am not convinced no plinth is better than having plinth. Just from a pure physics stand point, the SP10 has so much damn torque that you would think you really need something massive to hold down the turntable to sink all that vibration. Didn't Mark Kelly tell us that Sansui experimented something like this about that return torque that's causing the turntable cabinet to color the sound? From my experience with the naked approach, the set up did have that typical Technics clinical sound so I would imagine having a massive plinth is the right approach to high torque DD turntable like the SP10. I am not sold on your approach but, hey, if it works for you, great, because that certainly saved you ton of money on plinth. But before I try the naked plinth thing again, I can't wait to mount the naked motor to a slab of slate!