If you use isolation under your table (Townshend Seismic Pods, roller bearings, air bearing), the material of the shelf will not matter (as much?). I still have a couple of Torlyte shelves, the extremely low-mass design (hollow balsa-wood construction---very stiff, very non-resonant) big in England in the 80's and 90's. Linn-inspired, of course. Some of Ikea's butcher blocks are made of Bamboo, somewhat low-mass. What's so special about Maple? The best drum shells are made of Maple because of it's resonance and long sustain, not what I want in a support structure for my table!