Albert, at CES, or really THE Show, StillPoints showed their component stands combined with vertical pillars between them. This allows making a stand with many different heights, widths, and depths. You could fit one into your frame.
I am told that such a rack is the equal of the StillPoints rack. I have yet to compare one with my rack. I will soon have the capability to do so, but the component stand rack is to allow me to isolate all the components that I use, not just that fit on my rack. One real benefit of the component stand rack is not having the acrylic shelves.