Look up DWR bed runners. They are the width of the bed but sit across the foot instead of covering the entire bed.
Here is an example from Keepsake that will give you an idea. Only two rows of rings...
http://www.keepsakequilting.com/productdetail/6382.htm
Good luck! I am hoping to make one of these some day - but now perhaps I will move it down the list a bit until I am better at all skills!!!