I use a rubber plug from lowes, it comes in various sizes, ,got it from free since there was no packaging for it..it's black in color..just an idea for u..
Depending on the inside dimensions of your stand ..a simple way to do this is to purchase an upper cabinet from Lowe's that are made for kitchens and gut it..the Lowe's pre- fab cabinets have solid oak doors on them..u just have to seal it..and then u can add legs on them , make sure to use...