These are part of the headboard and foot board. These panels will be in the frame of the other pieces below. I am terrible at describing, and taking pictures, if you are very patient you will get the idea as it comes together.
We are painting these parts before we put them together. We should be putting them together soon and then they will look more recognizable as a bed. So this will be a twin loft with a storage unit built into the end of the loft, and then a full size bed under it in a L. More pictures to come, now that the camera and my will have both been found check back for new pictures.