timbernation can make a rack to any size you prefer out of solid maple or walnut. i'm sure mapleshade can customize their racks for you as well. i've never purchased anything from eithe company, but they have a good word of mouth reputation from what i've seen.
how long have you had your components? i would say wait at least two or more years before committing to a custom sized rack as it would be a shame to have a small rack custom built only for you to change one of your components out for a standard size piece that no longer fits on your rack. i'm sure you've already contemplated this, but just in case...
