When it’s expensive it must be beautiful at least! OMA Graphite plinth are beautiful and designed by professional designer with a good taste! The armboards are beautiful (round shape), especially the version with technics drive mounted without square chassis, in my opinion the armboards must be made from the same material as the rest on the plinth and everything must look like one piece. What is the ugliest on the stock Obsidian Technics plinths is the armboard frame and cherry wood in this frame. All the plinths that just imitate the original obsidian design are terrible in my opinion. What is the reason to hide Technics drive lower in the plinth if it can be just on top of the plinth just like this (sp20) or like this (sp10mk2).
All commercially available plinths are extremely expensive from $2k up to $10k (just for the plinth alone).
A custom made plywood plinth should not cost more than $300 in my opinion, veneer with exotic wood is optional, some top quality lacquer is also optional. It can be automotive paint also. Basically a plinth is just a plinth, I would never pay more than $700 for whatever plinth.
This is not Technics, but the plinth design is super stylish (look here) in my opinion and it’s Graphite.
When Technics square chassis is removed this shape of the plinth with round armboards is nice in my opinion.