See if you can find a good computer tower stand (they have a similar footprint to a 33H) and then add spikes or cones.
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I own a granite import/fabrication company that typically makes 1" thick granite slab platforms for amps and speakers all the time.
You can see the granite colors at www.fromangranite.com
If you are interested, e-mail me your dimensions and granite color. I can give you a great price.