Lamar - Bobby C did exactly that on his 2008 Monarch, a sister to the Admiral you have. I think he posted photos on the "Quick Tips and Easy Mods" thread at the top. You may want to take a look at his pictures for some ideas.
Those of us who are less handy
just bought one of those plastic cupholder/CD/cellphone holders that are designed to sit on the transmission hump in a car or truck. It's not nearly as nice as a matching wooden tray and drawer but it works for us!