Getting granite tomorrow.

Making an isolation platform for my Acoustic Signiture TT. It is 18x24. I have this materials. Granite slab 1 1/4 thick. 2 MDF boards 3/4 thick each, Cork one inch and 2 rubber truck liners 3/4 inch thick and 8 wooden buttons for support. I was going to put MDF boards on bottom then rubber then cork and last granite on top. Is this the best order? Or should I make 2 sandwiches out of materials? Also If I dont use spike cups for TT will I crack the granite or damage the spikes? I though it may make a better isolation or do you think it would matter. Any opinions appreciated