I have designed a home cinema equipment rack to enable all my source components to be held conveniently with my home cinema pre-amp, and most importantly the centre speaker. The problem with centre speakers being positioned on the hi-fi rack is that the the speaker vibrates, and this will feedback to the components and cause a degradation in sound.
I therefore designed a rack, where the centre speaker is independently held up with a separate stand, but it appears to be integrated into the design of the hi-fi rack. I then commissioned a cabinet maker to build it in solid ash, with 10mm thick glass shelves, adjustable for height. The result you can see above.