Tonearm mount to the plinth vs arm board vs rotating arm board vs isolated tower

That has been my experience as well sciencecop. FWIW Brass seems to dampen aluminum very effectively in combination with soundcoat material (1/16" thick sheets).  

Great, now I have to worry about ear cancer

Interesting Chakster / Thanks 

Halcro,
My TT is a labor of love. I designed, machined, & built it myself over a couple year period.

• The platter is 4" thick solid 6061 aluminum (powder coated) with a 1/4 inch of delrin bolted directly on top.
• The plinth is 2" thick, also 6061 but dampened with soundcoat material from parts connexion.
• The bearing is a little complicated and I’m not going to get into specifics, but the thrust portion & the sidewall portion are separated. Both are attached to the platter with as little interface as safely possible. It is made of aluminum with a very thin hard coat material in the "wear" sections. It is absolutely smooth without noise or "vibrations".
• Tonearm tower (or pod) is made of aluminum, brass, ceramic, & delrin. I have it set up in a tripod manner for rigidity.
• Flywheel is also powder coated 6061 aluminum as is the motor cover. The motor itself is a Hurst.
• The record clamp is delrin, anodized aluminum, & acrylic stuffed with quartz powder.
• I purchased the tonearm from ViRa (12" version)

Although I’m sure there is better, it really does sound great. At some point I’ll dampen the platter with brass or lead-shot type materials, & probably do the same to the plinth & flywheel.

Sorry, no current pictures on-line chakster.

Not sure what is best for your turntable but in my experience you can get great results putting the tonearm on a tower separated from the platter/plinth. In fact I have the motor, flywheel, platter/plinth, & tonearm tower all separate. Each "component" sits on Isoachostic feet. The flywheel, platter/plinth, & tonearm tower are on the same platform, while the motor is on a separate platform.