Jdombrow is quite correct when he mentions resonance issues. A 6 ft long piece of maple could give you trouble. If you got yourself 3 rock maple butcher blocks of the size I am thinking of (23" x 19") you would have just under 6 ft of usable space. In 3 sections you could also configure them in different ways should your situation change.
The John Boos blocks I use are 100% hard rock maple, come in a variety of sizes and thickness. I am currently constructing a custom two-shelf rack from 23 x 19 x1 slabs with a hand rubbed and buffed tung oil finish, 5/8" threaded rods, and I will be using Audiopoints 5/8" inside thread cones to couple the rack to the floor. It's going to look great and work very well too.
The John Boos blocks I use are 100% hard rock maple, come in a variety of sizes and thickness. I am currently constructing a custom two-shelf rack from 23 x 19 x1 slabs with a hand rubbed and buffed tung oil finish, 5/8" threaded rods, and I will be using Audiopoints 5/8" inside thread cones to couple the rack to the floor. It's going to look great and work very well too.