Tonearm mount on the plinth or on Pillar ?

No thanks, Raul.
This is not to say you and Halcro are "wrong".  Really, really; I don't care.  I am sure that your system, and Henry's system too, are wonderful.  Both of your systems differ from mine in very many ways, other than turntable/tonearm linkage, and it is not incumbent upon me to try out all the variations in order to say that I prefer what I have.  Over 40 years, I've been there and done that.

The OP asked for opinions. I have stated my opinion and the theoretical why of it (and so has Atma-sphere in a more elegant treatise), and that's all I care to do on this subject. Like I also said, I fully approve of Halcro's current TT101 set-up, even though he may believe we are at odds.  (Your set-up may be just fine by me, too.  I haven't seen any photos, so I cannot really say.) Like you say, enjoy the music. I certainly am.

Chris, thanks for the update on your SP-10 Mk 2.  Your idea to mount your arm on a separate pillar and then bolt the pillar to the base (plinth), same as for the motor unit, is similar to the direction I've moved.  That is sort of a "middle ground" between a naked table and one that is directly connected. ;^)

My thinking is by not mounting the arm and motor unit to the same top layer of whatever material in the plinth but still have a fixed connection, any energy transfer between the two will need to travel a greater distance and (likely) through different materials, and thus be absorbed or at least diminished.  Now after multiple false starts I need to find someone local with the proper tools to build it for me.

I’ve seen many arm pods, but this one ( TH-100) is the most exotic solution along with this heavy TM-10 metal plinth by JoJo Toho Machine (i know nothing about this company).

It’s called Toho Player base System for Technics SP-10mk2, also for Victor and Denon turntables.

This design looks as solid as Neumann cutting machine imho.

I wish i could get time machine to buy this Toho Base for my SP10
There is one for Halcro’s Victor table too (more elegant than naked victor imho)

How do you like it ?

Chakster, that Toho stuff looks very nice.  Do you know anything about cost and who sells it?

Lewn, it looks very attractive, i’m afraid this is vintage advertising.

There is only phone number on the poster!
Someone should call TEL/ (03) 908-0320 :))
Who can read/speak japanese?

Prices for Toho Player base Systems:

TM-10 (Technics) plinth weight 27kg, price 230 000 Yen
+TH-100 Arm base weight 5.9kg , price 88 000 Yen
and something called M-3, m4, m5, g23, g30, g41
(additional armboard?) starts from 12 000  to 68 000 Yen!

TC-20 (Denon) plinth weight 29kg, price 230 000 Yen
TV-30 (Victor) plinth weight 24kg, price 210 000 Yen
+TH-80 Arm base weight 7.6kg , price 33 000 Yen
and p23, p30, p41 (additional armboards?) for 6 800 Yen

If it was made in the 80s then the price is tough!