I am sure this has been discussed but want a fresh take. Mapleshade / Timbernation racks?

I like the Salamander Archetype, but I wish that Salamander still made the twin platform (double-wide) Archetype shelf.

Personally, I don’t pay much attention to vibration control except with a turntable and loudspeakers. You don’t want your turntable moving. And you want sand-fillable speaker stands. However, with electronics, the need for vibration control is exaggerated, IMHO

Listeners say they want sound equal to a live concert, but how do they control vibration at a live rock concert? The answer is that they don’t. 

Corian or other solid surface makes excellent shelving for audio racks because it’s so dense and inert. 

I have a TimberNation Rack.  Very good isolation and very solid, at 135 pounds.  I highly recommend their racks and isolation platforms.

I'd check to see if there are any talented carpenters in your area who could build exactly what you want without any compromises.

All the best,
Nonoise

Sound Anchor is my fav.