What material best for a custom amp stand

I plan on having a custom amp stand built to hold my current 250lb 2 channel amp. I will place it behind closed doors so appearance is not important. I was planning on having a metal shop create something (although I am open to other ideas). My only requirements are that it support the weight, that the platform is approximately 6 inches off of the ground, and that it doesnt vibrate. It will rest on a concrete floor. Thanks in advance for your input.
Personally, I like maple wood. It's economical, dampens vibration and should be at least 3 inches thick with isolation spikes. I believe there is a guy making these types of stands to custome specs here on Audiogon.
2"-3" thick should be no problem, check this site or Mapleshade products.