feet and legs

I had a 250 lb 'slab' of maple made on which I will place all of my equipment. It is 7.5' long x 2' wide x 4" thick.
My room has a suspended, hardwood floor.
Right now the slab is on the floor but I would like to raise it up 1" to 3" and I'm looking for something to put between the floor and the slab that will treat the vibrations coming up from the floor. I say 'treat' rather than 'absorb' because I've always disliked the effect that rubbery substances and textiles have on sound.
Whatever I put under the slab has to hold at least 750 lbs.

I'm considering Sistrum stands but am having a hard time getting in touch with the manufacturer.

I'd like to go with a Harmonix product but they are outrageously over-priced.

I'm thinking about making my own feet from wood: can someone suggest a species of wood that might work for this purpose? If so, what shape should it be? I wonder if ebony would work?

Any ideas would be appreciated. Please don't comment if all you want to say is something like: "why didn't you just buy a rack from..."

Thanks