Here, I have finished the left side wall frame. The door will be on the left side, but I have built it all as one unit for now. I will cut out the parts of the top and bottom rail that are where the door is located after I have everything fastened in place. Notice that the front and rear uprights on the left side (right side of the photo) are different from the right. That is because I made a slight design change after building the right side. I realized that I won't have a surface to glue the skin to on the inside of the corners. I will just put additional blocks of wood in the corners, but for these two corners, I decided to put a 2x4 to cover for one side of the corner.