I must say that this was a very unscientific build. The only reason I put the ply into the mix was to offset the sag that I have witnessed with a recipe of MDF+Weight+Time. The fact that the ply might have a CLD effect was an added (bonus) advantage versus a cognitive design aspect...
I have read cat-squirrels site quite extensively and I consider his research and opinion in the highest regard. That said, turntable plinth building still confounds me. There is so much information out there yet there is so little information that is tied to some scientific research. That is not to say that conventional wisdom and experienced wisdom need be discounted. I just need to form my own understanding and I need to experiment myself a whole lot more...
To make things more complicated it would seem to me that every table or at-least every table type would also seem to need a different plinth strategy. some examples:
Thorens TD150 (suspended deck). For this type of deck the main function of the plinth in my view is to rigidly support the suspended deck. Damping should be taken care of by the suspension mechanism (with correct set-up)...
Lenco L75. This deck on the other hand has a serious Achilles heel in terms of mechanical rumble. General wisdom out there on the world wide forums is that a plinth good at absorbing and dissipating that mechanical rumble is needed. So most plinths seen built are the mixed material CLD type...
Technics SP10. What is the strategy here? According to measurements, the table has an almost unmeasurable rumble. Then mention is made of something big and heavy to negate the massive torque of the motor. But that torque is spooled back (drastically) once the platter is spinning at speed (in a quarter turn)...
thezenroom, I am by no means discounting your observations and advise, I am just trying to wrap my head around the various plinth building concepts... Maybe i should read less and build more
I also feel I need to develop a more methodical approach to these builds. Let me expand with pictures
Technics SP10 + Audio Technica AT 1501 + Ortofon 2M blue by
arclients, on Flickr
versus
Technics SP-10 Mk2 Plinth Build - playing some toones by
arclients, on Flickr
Notice the difference?
OK, yes, the plinths are completely different as are the cartridges but the small difference is that the original broadcast plinth had the arm mounted on foam and mine I neglected the foam and fastened the arm hard to the armboard....
Now I mentioned that the bass has improved and become more legible (defined)... What proportion of the mix has improved the bass?
The different cart,
the different plinth
or the methodology used to mount the arm?
Too many changes, too little documentation and observation...
anyway, I am rambling
It's a journey
lo-behold, moved it over and 
SP10 plinths can look a bit lumpish but the tapered edges/corners and contrasting inserts/top panel on yours does a good job of disguising the sheer bulk of the thing.
