I posted the shelf project that I completed last week in the H240 Mods page.
I had run across a shelf like this in the forum last summer but way unable to find it again. I make a mock up and fiddled around with it until I go the size right. I also added a second power strip for the boat under the shelf.
Hunter 240 Owner Modifications and Upgrades
Hunter 240 Owner Modifications and Upgrades
hunter.sailboatowners.com