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

Yes there is a difference that said is your plinth with these options 
going to be your final build/purchase or a test bed.

I built a plinth that accepts various arm lengths with multiple 
armboards. I decided the pivoting option was not for me and went with boards mounted directly to the plinth. Also various materials 
of construction for comparison.

One difference is the boards do not touch the exterior surface
and are attached to next layer below via threaded fasteners.

All sorts of opinions out there and some are easier to execute 
than others.

https://forum.audiogon.com/users/totem395

@halcro 

What weight did your granite base come in at?