ndmaitre: i quite agree with all the earlier posts re: decoupling, floating, etc. but suggest you scrap the idea of using wood veneered shelves. get some exotic wood for the posts and rails and use a resonance deadening shelf material, such as that available from neuance/greater range, instead. BTW, i do not own ANY neuance shelves but find them to be designed much like the zoethecus ones i do. (i don't recommend zoethecus slabs w/o zoetehecus stands.)
-cfb