Based on collaboration between an architect and stone mason your proposed stone stands should be pretty cool when completed.
Regarding your proposed Live Vibe Audio (former Star Sound) supports over your "2nd level wood floor," you do have several options. Based on your post, it sounds as if you plan to use the Live Vibe products between your monitors and the stone stands. If so, what are you planning on using between the stone stands and your suspended wood floor - anything? Another option would be to more firmly attach the monitors to the stands (i.e., Blu Tack or Herbie’s thin fat dots) and then either spike (i.e., Live Vibe) or decouple (i.e., Townshend or something else) the entire speaker/stand system from the floor. You could also use a decoupling type footer between the monitors and the stands, with the stands supported directly on the floor.
Many here have had good results using "squishy" footers (i.e., elastomers, springs, or another elastic material, but not spikes), and particularly on suspended wood floors. I had my main system on a suspended wood floor in two houses and currently have the system in a lower, walk-out level on a concrete floor. I have always mechanically attached my speakers to Sound Anchor stands (both floor-standing speakers and my current monitor speakers), so the speakers have been stabilized by heavy sand-filled steel stands with threaded inserts for spikes. I have tried a variety of support options on both the wood and concrete floors, including Star Sound brass spikes, Sound Anchor’s spikes, edenSound Bear Paw brass spikes, Herbie’s dBNeutralizer products for speakers, damped springs (similar to Townshend), and the platinum-cured silicone hemisphere footers that I am currently using.
I will not predict what might work best for your particular situation but, in my systems, I believe the "decoupling" products (elastomers or springs) have provided both the easiest set up and the best sound. If you wanted to try an inexpensive option, look at these platinum-cured silicone hemispherical footers. Since they are sized by the weight to be supported, the big 2.5-inch version (supporting up to 100-pounds per pod) could possibly be used under the stand/speaker combo or you could try one of the smaller versions between your speakers and the stands. I use two different sizes (2 and 2.5-inch) under my 180 pound speaker/stand combo to provide a small amount of back-tilt as recommended by the manufacturer. One thing I noticed is that the 360-degree motion of the pods is similar to the behavior of the speakers when I had them supported by damped springs, and the frequency also seems similar based on attenuation behavior when excited.
