hdm, the Michell Gyrodec is not an isolated turntable. An fully isolated turntable will have a suspension, spring or air tuned to 2-3 Hz. Nothing gets through from 2 Hz down. On a wooded floor I can jump up and down in front of an SME or SOTA and nothing will happen even if I put the turntables on collapsible card tables.
Having said that. The ultimate platform for an unsuspended turntable would be a 2" thick aluminum plate on leaf dampened leaf springs tune at 2-3 Hz. Getting the plate is not a problem. Any metal supply company can provide that. Then you can have it anodized any color you want. The right springs will require some experimentation. I would stare on the stiff side and work my way down. The springs can be dampened with foam or you could even construct an oil based shock absorber like SME does.
If your system is on a concrete floor you can just place the Aluminum plate on any decent stand using rubber grommets under.
Having said that. The ultimate platform for an unsuspended turntable would be a 2" thick aluminum plate on leaf dampened leaf springs tune at 2-3 Hz. Getting the plate is not a problem. Any metal supply company can provide that. Then you can have it anodized any color you want. The right springs will require some experimentation. I would stare on the stiff side and work my way down. The springs can be dampened with foam or you could even construct an oil based shock absorber like SME does.
If your system is on a concrete floor you can just place the Aluminum plate on any decent stand using rubber grommets under.