The adjustable wire shelves are what I find works great, I use them for fans, but other collectors have used them for vacuums, Constellations included. They are the ones you used to see in restaurants but now used in stores for display shelving. Home Depot and Lowes have them as well.
They are pretty easy to put together and you can get different colors, chrome, black, etc. Also different heights, widths and depths.
