You saw this project else where?
Gloria: maybe this will be helpful
Here's a project where another Hometalk member used cabinet doors to hide her washer & dryer. I know it's not the same, but you could use the insulate once and adapt them to the structure that you need. I hope this helps and inspires you to creative thinking. Wishing you the best.
What style of closet door - sliding, bifold, accordion, or standard?