Tom, you mention the need to level. I can understand that for your turntable, but remember that a three legged rack, such as the Star Sound Apprentice is alway with all three feet in contact. Of course the design of all the Star Sound devices is to get the vibration to the floor and to the Earth. They would not be good for foot falls.
The old Stillpoints component stands and pipes can be used as a two level rack that is fairly cheap using Ultra Minis. Stillpoint technology is somewhat helpful for footfalls. You would not want to go over two shelfs high, however.
One thing that I would discourage is wooden shelving. It robs the music even worse than rubber. There always is wall shelving but I've never had any. Vibrations have such substantial impact on fidelity that you really need to consider them.
The old Stillpoints component stands and pipes can be used as a two level rack that is fairly cheap using Ultra Minis. Stillpoint technology is somewhat helpful for footfalls. You would not want to go over two shelfs high, however.
One thing that I would discourage is wooden shelving. It robs the music even worse than rubber. There always is wall shelving but I've never had any. Vibrations have such substantial impact on fidelity that you really need to consider them.